Pregnancy by trimesters: fetal development and woman's sensations. All trimesters of pregnancy by week, indicating the most dangerous periods How are trimesters during pregnancy divided by week

This is an important stage in the life of every woman who decides to start. However, this long-awaited event may not be as easy as expectant mothers would like. This must be monitored and must be prepared for this. That is why many are interested in what kind of course at what time is normal and how a woman should feel in a certain period.

About the timing of pregnancy

The body of a woman is endowed with everything necessary for a successful and child. However, in the modern world, for the sake of the health of mother and baby, it is necessary to monitor the development of pregnancy not only for the woman herself and her relatives, but also for the doctor. In order to make it more convenient, they are divided not only into months, but also into weeks and trimesters, each of which is associated with functional changes in both the body of the mother and the baby. From the moment a woman finds out about her pregnancy, she needs to be registered at the clinic and observed by a doctor who draws conclusions about the condition future mother, depending on the week or trimester.

Important! You need to know that immediately after conception, at the time when you should have your period, bleeding is still possible. Menstruation after intercourse is not yet a 100% indicator that a woman is not fertilized.

So, the weekly pregnancy calendar should look like this, if you start counting from the first day of the last menstruation:

week number after	Description
	The first week after conception cannot yet be called pregnancy, since monthly bleeding is still possible during this period, but the body is already ready for.
	middle of the cycle. Most women get pregnant during this period.
	The morula embryo is fixed on the inner wall of the uterus, official pregnancy begins, the brain and nervous system of the fetus are formed, and the heart begins to beat. On the 26th day after conception, the embryo circulates blood independently through its own blood supply system.
	You can make it bought at any pharmacy, but it is possible that due to too short a time it can show false result. Although this is a short period of pregnancy, the muscular system, spine, eyes, ears, arms and legs are already forming in the fetus. Its length is about 2.5 mm, but the fetus is already taking the form of a little man.
	As a rule, it is at this stage that a woman suspects that she is pregnant, since she is absent. The child's fingers are already visible.
6	Most women complain of nausea and malaise, but these symptoms may or may not be present. You can already see how the baby moves. The baby's heart beats twice as fast as the mother's.
	is in a relaxed state, begins. The length of the fetus can already reach 9 cm. The baby's face is being formed: eyes, mouth, nose appear.
8	There is an imperceptible increase in and . Baby teeth begin to appear, he is better than his height - from 22 to 30 mm, and weight - about 4 g.
	Noticeable changes in your appearance does not occur, but the fetus can already bend its fingers into a fist, you can distinguish a skin pattern on them.
	The uterus doubles in size. Due to the high content of hormones, the mood and well-being of a pregnant woman changes quite often and dramatically, she becomes too excitable, begins to gain. Possible enlargement of the thyroid gland. The child already knows how to squint, wrinkle his forehead and take sips, gain strength and can push off the walls of the uterus, but because of his small stature and weight, the mother does not feel this.
	The mother's metabolism accelerates due to an increase in the volume of circulating blood, a feeling of internal heat may occur, thirst for water increases and, as a result, sweating. The baby has already formed all the organs, he can react to light, noise, etc.
	The width of the uterus increases by 10 cm, the pregnant woman feels her tightness in the hip area, then the uterus rises into the abdominal cavity. It is already possible to determine the approximate nails in the child, a sucking reflex has appeared.
13	The pregnant woman becomes less irritable, nausea stops. The weight of the child reaches 28 g, the rudiments of milk teeth are already fully formed.
14	It is considered the beginning of the best period of pregnancy, when a woman becomes more energetic. The stomach rises gradually. The child's genitals are formed, its size is equal to the size of the mother's palm.
	While the mother's hair can fall out significantly, in the baby they begin to grow, his weight reaches 50 g, and his height is 13 cm.
	The uterus and the amount of amniotic fluid are increasing, which is now 250 ml. The child has already developed facial expressions, he can open his mouth. At this time, the baby already feels all your experiences, so they should be avoided.
	You can already feel the baby moving if it's yours.
	During the first pregnancy, you can feel the movement of the baby at this time. The child already partially sees.
	The brain grows especially actively, which affects the silhouette of the child: the head becomes disproportionately large. You need to talk to the baby.
	It is already clear from my mother that she is pregnant. She feels when the baby is active and when he sleeps.
	Taste nipples are already formed on the baby's tongue, so when he drinks amniotic fluid, he can smack his lips.
	The baby can already touch his face and legs with his hands. Mom is possible physiological. It is necessary to establish and consume more food, one of the components of which is.
	The child begins to grow fat, its weight reaches half a kilogram. The kid is very active, requires walks and attention of parents.
	The fetus continues to gain which already reaches 600 g, so the mother often runs to the toilet, feels headaches and heaviness in the stomach. The face of the child is the same as it will be after birth. If at this time the baby can survive with proper care.
	The uterus is the size of a soccer ball. It is determined which side of the baby's body will be a priority - right or left.
	Now the movement of the child can be felt not only by you, but also by your family. The baby can already open his eyes.
27	The child feels when you stroke your stomach: he can either quiet down and enjoy, or, conversely, actively enjoy it. He already feels the tightness of the womb, his weight is 900 g. The probability that the child will survive if premature birth occurs at this time is 85%.
28	Already fully developed are some convolutions of the brain, but it still continues to grow. The mother's body is preparing to begin with milk. If the baby is born at this stage, he is legally considered a person whose birth must be registered.
	The skin of the baby becomes denser, more fat accumulates.
	The baby can already distinguish the rooms in which the mother is located by lighting. Recognizes the voices of loved ones. Mom gains weight, her movements become more and more slow and clumsy, because of the load on her back, her lower back hurts.
	The weight of the baby can already reach one and a half kilograms. In order to increase the space, the baby can roll over with his head down and press his legs up, which causes discomfort for the pregnant woman.
	The child already distinguishes voices very well. Talk to him as often as possible, you can even sing him lullabies.
	There is a formation of a substance due to which the baby after childbirth will be able to breathe independently. The baby should already be turning head down in preparation for birth.
	The child develops taste habits for the dishes that you eat. Contractions may begin, which go down from above and subside.
	The baby can already scratch himself, which will be seen after birth. Its weight already exceeds 2 kg.
	The child's face becomes plump and smooth due to an increase in the amount of subcutaneous fat.
	There is a preparation for childbirth: the head of the child goes deep into the pelvic area, the mother feels some relief. At this stage, the pregnancy is already considered “full-term”.
	There are no significant changes. The weight of the baby can reach 2.5 kg.
	The cervix is ​​shortened and opened. The pressure on the bladder is very strong.
	It is very important for a future mother to remain calm and balanced, to know relaxation techniques and proper breathing during contractions.
41	There are no changes, except for an increase in the weight of the child.
	Statistics say that only 10% of women have not yet given birth before this period, but you should not worry about this, because a mistake in calculating the term is possible. You should start talking to your doctor about labor induction.
43	At 43 weeks, the baby is already overdue.
childbirth

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Did you know? The longest pregnancy in the world lasted more than a year - 375 days. At the same time, the “post-term” child was born absolutely healthy and did not differ in non-standard parameters.

Flow features

In addition to the fact that the gestational age is calculated by days, weeks and, of course, months, it is also divided into trimesters to make it more convenient to monitor the development of the fetus. The obstetric gestation period, that is, the one that is used and considered by doctors, is 280 days, they are divided into three trimesters. The duration of each such trimester is about three months, and each of them has its own characteristics.

This table shows data on the trimesters of pregnancy, calculated by week:

The first

The first trimester of pregnancy is considered the most important, because it is during this period that a small person is formed from the accumulation of cells. At the end of this period, it can be argued that the embryo has in its infancy all the main organs and systems: the nervous system, brain, heart and vascular system. Even at the beginning of the first trimester, the child's heart begins to beat, and at the end - he can already move, but the mother does not feel this yet, because the fetus is still too small.

Important!It is in the first trimester that the probability of miscarriage, the appearance of organ anomalies or fetal malformations is highest, so a pregnant woman should monitor her diet, lifestyle and regularly visit a doctor.

During the 1st trimester of pregnancy, and this is the first 13 weeks after conception, A future woman in labor is advised to rest as much as possible and get enough sleep. You need to sleep as much as your body requires in order to feel alert, even if it is much longer than your standard sleep.

Due to the active flow of blood to the uterus, other body systems can feel a lack of oxygen, which causes dizziness and fainting. Perhaps a significant change in tastes in food due to a lack of certain microelements or vitamins in the body. It is in the first 13 weeks that 70% of women show all the signs of constant nausea, especially in the morning. Concerning. Blood circulation is increased by 40% so that the baby can eat and can compensate for the loss of blood during childbirth. With the gradual disappearance of vomiting and nausea comes a load on all organs and systems of the body of the future woman in labor. Constipation and hemorrhoids may appear.

At this stage, active communication between the mother and the child begins: she already feels his movements and pushes. The growth rate of the fetus is maximum, along with this, its need for nutrients also grows, so the mother “eats for two”.

In terms of premature birth, miscarriage or the development of fetal abnormalities, this trimester is considered the safest. But you still need to visit the doctor regularly - at least once a month. You need to come to him with new results of a urine test. In addition, at this time it is necessary to donate blood, urine for culture and pass a glucose tolerance test.

Third

in the 3rd trimester, which starts on the 28th weeks of pregnancy, the child is actively preparing for the birth. He can already see and feel the taste, is rapidly gaining weight due to the appearance of subcutaneous fat. At this stage, you can see what he is - your baby - because his face has already acquired those features that will be visible at birth. The fact that the weight of the fetus has grown significantly, of course, affects the well-being of the mother: she often runs to the toilet, because the fetus presses on the bladder, complains of back pain due to unusual exertion, and may experience a lack of oxygen, as the fetus props up the lungs .

This stage is characterized by an increasing risk of preterm birth. However, at this stage, the child, with proper care, can survive outside the womb.

Did you know?It is believed that the female body“remembers” the premature intentional or unintentional termination of a previous pregnancy, therefore the period at which it was committed is considered dangerous for the current pregnancy. At this time, you need to monitor the condition of the baby with close attention. In addition, the days on which menstruation should have begun if fertilization had not occurred are considered critical.

During this period, you need to re-donate blood for general analysis, clotting, sugar and for re-diagnosing viral diseases. Also, the doctor, as a rule, prescribes to do cardiotocography and retake a smear for the flora.

1. Pay special attention to eat small portions 5 times a day, eat food enriched with protein and iron. It is necessary to avoid the use of sweets, preservation and.
2. Start preparing your body for pregnancy in advance. This is especially important for the back. If you go to and take a course to strengthen the back muscles before pregnancy, during pregnancy it will be much easier for you to cope with stress on the lower back.
3. Avoid heavy lifting.
4. Protect yourself from viral infections by all means: avoid crowded places, infected relatives, wear a mask, etc.
5. Do not use cosmetics that you are not sure are safe.
6. Take everything only after consulting your doctor.
7. Go to the dentist every two months.
8. Wear underwear made from natural fabrics only.

During pregnancy, the fetus develops rapidly in the womb. The period of bearing a child is not easy, and it is very important at this time to do everything so that the baby is born, and the birth for the mother is as easy as possible. It is for this that you need to monitor pregnancy and regularly see a doctor who will tell you how the child is developing and whether there is a risk of pathologies or premature birth.

To make it more convenient, the pregnancy period is divided into weeks and trimesters, each of which has a number of significant characteristics of both the well-being of the future woman in labor and the level of fetal development.

The most detailed pregnancy calendar

The happiest time in the life of every woman - pregnancy - is divided into time stages: trimesters, months, weeks. Each of these units of time has the peculiarities of its course - both in the body of the expectant mother and in the body of the future baby. We will talk about all this in the most detailed and understandable way.

Living stories to help

In addition to medical (gynecological) information from experienced obstetricians, we will share with you the real stories of thousands of Babyblog mothers on the pages of our calendar. They are equipped with expressive photographs, ultrasound images, descriptions of sensations in one or another obstetric week of pregnancy. We will also give you tips and recommendations for each of the stages on the road to a miracle.

On the verge of a miracle

In order to receive a newborn carefully wrapped in a diaper for the first time, to hear its first cry, to smell its smell, you have to climb the happy ladder of forty steps - forty weeks. Not one of them stumble, do not grumble about fate, do not complain about ailments. On the top step of this amazing staircase, you will spread your wings and go on a magical flight of happy motherhood. The miracle is close at hand!

Listen to Experienced Moms

It is very important at the time of bearing a child not to worry once again, not to quarrel with loved ones, not to allow phobias and stress. It is for this purpose that each week of pregnancy of our unique calendar is accompanied by useful tips and good recommendations of experienced mothers who have gone through this path more than once. You will be calmer when at each time stage you can find out the experience of other mothers in this or that issue of your well-being and the healthy course of pregnancy.

How is the pregnancy going?

In the first obstetric week of pregnancy, the female body begins to prepare for possible fertilization, which will occur later.

In the second week, the "leader" in this cycle is determined - the egg, which will give rise to a new life.

As a rule, at the end of the second - the beginning of the third obstetric week of pregnancy, fertilization occurs - the fusion of a mature egg with the most nimble and persistent sperm from a huge number of applicants. How loving man completely dissolves in the object of his passion, so the sperm dissolves inside the parent egg. The genetic information of the parents is combined. Now a new life exists!

At the fourth week, the baby is a lump of rapidly dividing cells. When viewed under high magnification, the embryo resembles a raspberry.

At the fifth week of pregnancy, the laying of the most important systems begins. Now the heart, blood vessels and respiratory system are being formed - something that is vital for independent existence.

Next week, the future baby has a hint of arms and legs, separate parts of the inner ear and larynx are formed.

At the seventh week, the fetus actively develops the brain, the gastrointestinal tract begins to form, and the lungs form.

In the eighth week, the great sculptor - nature is engaged in fine work. Ears, nose and upper lip are now formed, as well as fingers on the hands.

At the ninth week of pregnancy, the back of the embryo will begin to straighten, and the tail will “dry out”. The baby's brain develops at a tremendous pace.

The laying of milk teeth begins next week. The embryo is now surrounded by amniotic fluid, protecting it inside from shock and shaking.

At the eleventh week, the unborn baby already has sexual characteristics, and with the help of modern equipment, future parents can now find out who is inside - a charming girl or a strong little boy. In addition, the color of the eyes is determined in the fetus.

By the twelfth week of pregnancy, the future baby has practically formed all the systems of the body. In the remaining time, they will grow and develop.

The thirteenth week ends the first trimester of pregnancy. The placenta is fully formed. Now she will be responsible for the delivery of nutrients and oxygen from mother to baby.

At 14 weeks, the baby is covered with a gentle fluff - lanugo. It retains a cheese-like lubricant, which in turn protects the baby from the surrounding waters.

It has been proven that already at the 15th week of pregnancy, the baby's tiny heart passes more than 20 liters of blood per day. The skin of the belligerent is thin and red, it is still so different from a well-fed baby.

At the sixteenth week, the fetal head is no longer so pressed to the chest, it gradually straightens. The muscles of the face are developed, so the child can wink and frown.

At week 17, "brown fat" begins to be deposited, which is necessary for the body's heat exchange. But there is still no subcutaneous fat.

At the 18th week of pregnancy, the baby can already hear you, as the structures of the middle ear are being improved. It's time to talk to the child and sing children's songs to him.

The following week, the limbs grow and become more proportional.

At the twentieth week, the puffer is a miniature man - with a delicate fluff on his head and tiny nails on his fingers and toes. He has a lot to do - the baby yawns, sucks his fist, somersaults.

In the twenty-first week, blood cells begin to be produced, which are responsible for protecting the body from infections. Thanks to the developed papillae on the tongue, the fetus feels the taste of the surrounding waters.

At week 22, the baby strokes his arms, legs, face, sucks his finger and pushes off the walls of the uterus with his legs.

At the twenty-third week, the fetus begins to store subcutaneous fat.

At the 24th week of pregnancy, the baby becomes larger and more well-fed. It occupies almost the entire uterus, it becomes more and more difficult to tumble.

The next week, bones are strengthened, joints are formed.

At 26 weeks, the baby is able to open his eyes.

The third trimester starts with the twenty-seventh week. A baby weighing approximately 1000 g has all the main systems working, although their development has not yet been completed.

At week 28, the brain grows, new cells and nerve connections are formed.

At the twenty-ninth week, the baby has already learned to more or less regulate its own body temperature.

At the thirtieth week, the baby's eyes are wide open, he reacts to the contrast light penetrating through the mother's tummy.

The following week, the baby reacts to loud noises and pain. You can feel it move as the doctor feels your abdomen.

At 32 weeks of gestation, the baby hears perfectly what is happening outside the tummy. He recognizes the beating of his mother's heart, bowel movements and the sound of blood flowing through the umbilical cord. That is why the baby calms down after birth if the mother presses him to her chest, because he hears the usual sounds of her heart.

At 33 weeks, the baby still has enough space for movement, but every day the space of the temporary house - the uterus becomes more and more cramped for him.

By the next week, subcutaneous fat is already a tenth of the baby's weight, which gives the skin of the fetus a smooth and pinkish tint.

From week 35, the baby will gain 200-220 grams weekly to his current weight (approximately 2550 g).

The next week, the baby's face became smooth, plump cheeks appeared.

At week 37, the baby is ready for birth and has taken its final position in the uterus.

At 38 weeks, the baby lost lanugo. There is less original lubricant.

At the thirty-ninth week of pregnancy, the walls of the uterus contract from time to time, "rehearsing" childbirth.

At the fortieth week, fetal movements slowed down in anticipation of birth. His intestines are filled with original feces (meconium). The appearance of the crumbs into the world should be expected at any time.

At 41 weeks of pregnancy, all organs and systems of the unborn child are ready to start independent work at any time.

At 42 weeks, the baby grew long nails on all fingers, hair. His eyes are open, he is becoming more active again.

In our calendar, each week of pregnancy, we will consider in as much detail as possible. Welcome!

Pregnancy is a joyful event in the life of every woman who wants to have a baby. In addition, this is also a very responsible and difficult period, which can bring not only joy, but also anxiety.

Pregnancy is known to last 9 months or 40 weeks.

For convenience, the division of this entire period into trimesters, of which there are only three, is accepted. We publish a convenient table of pregnancy trimesters by week in this article.

You will learn how the weeks and months of pregnancy are divided into trimesters and what to expect from each trimester, all this should be known to any woman preparing to become a mother.

Very often we are asked - "the first, second, third trimester is how many weeks?" let's figure it out in order.

The start of pregnancy is counted from the last menstrual period.. Thus, it turns out that the first month of pregnancy begins even before conception. What happens in the first trimester of pregnancy:

• At 1-2 weeks of pregnancy, ovulation and fertilization of the egg occurs. How to calculate this day, read in a separate.
• At 3-4 weeks, the egg descends through the fallopian tubes into the uterus and is implanted in its wall.

If everything went well, the fertilized egg is fixed in the uterus, then the pregnancy develops further.

Therefore, 2-3 weeks of pregnancy are considered an important moment for its further course..

• In the following weeks, the embryo grows and develops.

Important systems of the body begin to form: nervous, bone, muscle.

• By week 6, the heart, arms and legs are formed.

The length of the embryo is about 6 mm.

• At 7-8 weeks, the rudiments of eyes, chest, and abdomen appear in the crumbs.

The first sense organs appear.

• 8-10 weeks - the child has a formed face, fingers and toes.

The fetus begins to move, but the mother does not feel it yet. The length of the embryo is about 12 mm.

• By the end of the first trimester, by 13 weeks, the baby's eyelids have formed, the child's genitals are distinguishable, and the sex of the child can be determined.

The first trimester lasts three months or 12-13 weeks. This period is very important for the development of the unborn child. Sometimes at this time, an abortion may occur if there are any pathologies of the embryo or violations of the health of the mother.

Let's figure it out together: and why is it being done? Is this examination really necessary?

An excellent device for relieving the load from the back is a bandage, and how do they differ?

Therefore, it is very important to lead a healthy lifestyle in the first trimester, get rid of bad habits, exclude medications and any substances that can harm the health of the future crumbs.

The body of a woman during this period is actively rebuilt. The hormonal background is changing. Breasts swell, nipples become sensitive. A pregnant woman becomes more emotional: quickly irritated or crying.

There are frequent urges to the toilet, because the growing uterus presses on the bladder. Toxicosis may begin.

Immunity is reduced so that the mother's body does not reject the embryo. In the first trimester, a woman should be especially careful about her health.

More rest, sleep, walk, eat well, avoid overwork and stress. The health of the unborn child depends on the health of the mother.

Duration 2 trimesters

At 13 weeks, the main organs and systems of the fetus are already formed, and the fetus takes on the appearance of a little man.

Border week 28 may refer to the second or third trimester. At 28 weeks, the fetus is already developed so that, with proper care, it is capable of survival.

By the fifth month, the rudiments of teeth are formed in the fetus, the fluff on the head grows. Eyelashes and eyebrows grow, but they are still colorless, melanin pigment is not yet produced. Individual convolutions appear on the fingers of the pens - prints.

At 6 months (22-25, 26, 27 weeks) the child's bone marrow functions, and the intensive development of the brain continues. The nervous system of the baby is already quite developed. He hears sounds from outside. Loud sounds frighten him, calm music has a beneficial effect.

In the second trimester, around 18 weeks, a woman first begins to feel the baby's movements (many as early as 16). This period usually proceeds quite well. Toxicosis passes, hormonal changes are completed, and with it abrupt mood changes and other early troubles.

The woman's belly becomes more and more noticeable and by the end of the sixth month, back pain may occur due to the increased load on the spine. In this case, the doctor may advise wearing a special bandage.

In the second trimester, it is important to undergo an ultrasound scan to assess the development of the child, to identify existing pathologies.

Looking for a gift for a newborn? Do help you in your work.

All mothers must know: - how many weeks do they do it, and is it really necessary?

3rd trimester. His dangers

The final stage of pregnancy is the last three months or the third trimester.

What week does it start? Usually it is considered from 28 to 40 weeks of gestation.

Starting from the 28th week, the baby's lungs are so formed that they are able to inhale ordinary air. The child sleeps and is awake, able to close and open his eyes.

By the end of 32 weeks, the weight of the child reaches 2.5 kg, and the length is 45 cm. From 33 to 37 weeks, the lungs have fully developed, the skin is smoothed, it becomes pinkish.

Muscle tone increases, the child can raise his head and turn it.

Reacts to bright light.

From 38 weeks, the baby is fully formed and ready for childbirth.

At 40 weeks, labor begins. However, this does not always happen. Sometimes labor can begin 1-2 weeks earlier or later than the due date.

Prolongation of pregnancy can have unpleasant consequences, so you need to go to the hospital if the deadline has come up, but there are no contractions.

Termination of pregnancy at this time can occur with some complications, although it is more accurate to call it premature birth. After all, a child after 28 weeks is already quite viable, although it requires special care. Complications of pregnancy during this period include:

• Problems with placental function
• High blood pressure in pregnancy (preeclampsia)
• Anomalies of the uterus and cervix
• Bad habits in a pregnant woman

This period is most often the most difficult for the expectant mother. Increasing discomfort from a growing abdomen, squeezing internal organs located in the neighborhood. In the third trimester, the following problems may occur:

Is your pregnancy easy?

EasilyNot really

• Difficulty breathing due to constriction of the diaphragm
• Lower back pain
• Swelling and heaviness in the legs
• Varicose veins in the legs
• Increased urination
• Increasing pressure
• Late toxicosis
• Other ailments

You need to tell your gynecologist about any problems of your body, which you need to visit weekly from now on. Most of these problems resolve after childbirth, but may require supportive care during pregnancy.

Thus, pregnancy is conditionally divided into three periods - trimesters. The table for trimesters of pregnancy looks like this:

TRIMESTER	MONTHS	WEEKS
1	THE FIRST	1-4
	SECOND	5-8
	THIRD	9-13
2	FOURTH	14-17
	FIFTH	18-21
	SIXTH	22-27
3	SEVENTH	28-31
	EIGHTH	32-36
	NINTH	37-40

This table shows the trimesters of pregnancy by week and month.

Trimester analyzes

Throughout the pregnancy, the expectant mother and child are under the supervision of a doctor.

Pregnancy management plans include regular check-ups, weighing, abdominal measurements by an obstetrician-gynecologist; consultations of other specialists, analyzes and research.

They will help determine whether everything is in order with the mother and child, and if problems are found, prescribe treatment in time.

Most examinations and analyzes will have to be done in the first trimester, when registering for pregnancy with your gynecologist.

In the first trimester, tests are taken to evaluate the following indicators:

• Characteristics of blood
• HCG level in blood or urine
• The presence of sugar in the blood and urine
• General indicators of urine
• The blood type and Rh factor are determined, if the mother has a negative Rh, it is necessary to determine the father's Rh
• The presence of infections in the blood (HIV, syphilis, viral hepatitis, etc.)
• Antibodies to ToRCH infections (toxoplasma, rubella, cytomegalovirus, herpes)
• The microflora of the vagina is determined by a smear and seeding for PPI
• At a period of 12 weeks, the first screening is carried out - a comprehensive examination, including ultrasound and a blood test from a vein. The main task of screening is to identify genetic abnormalities in the fetus.

This survey is optional. However, in some cases, or simply at will, a doctor may recommend it.

In the second trimester, re-examine:

• General blood analysis
• Once a month they give urine for analysis
• Second screening at 16-18 weeks
• The second ultrasound at 18-21 weeks, if the second screening was not done

The second screening includes a triple test. At the same time, the level of proteins is determined - AFP, hCG and estriol. This helps to rule out genetic diseases such as Down syndrome, Edwards syndrome and neural tube defects. Ultrasound looks at deviations in the formed organs and systems of the fetus.

Last trimester:

• Repeated blood test for infections (HIV, hepatitis, syphilis)
• A smear for microflora and genital infections from the vagina
• Urinalysis is given more often every 1-2 weeks
• Blood chemistry
• Last ultrasound and preferably dopplerography

Such analyzes by trimesters are mandatory for pregnant women during the normal course of pregnancy. However, when a woman has health problems or complications arise, the doctor will prescribe additional tests and studies, as well as specialist advice if necessary.

No matter what difficulties a woman faces in different trimesters of pregnancy, there will always be positive moments.

After all, it is so wonderful to watch how a baby is born, develops and grows. And such a miracle as the birth of a new life overshadows any difficulties that may arise during pregnancy and during childbirth.

Useful video

How the baby develops, you can see on next video. Check it out, it's something incredible.

The waiting period for a child is usually no more than 42 calendar weeks. The entire period of pregnancy is usually divided into 3 trimesters, each of which has its own characteristics.

In this article, we will tell you which week each trimester begins, as well as what features of the course of pregnancy you can notice, depending on its duration.

Sometimes doctors use a simplified method when calculating the gestational age - the maximum waiting period for a child of 42 weeks is divided into 3 equal trimesters, 14 weeks each. Thus, the 2nd trimester of pregnancy with this method of counting will begin from week 15, and 3 from 29.

However, another breakdown method is most often used - using a special table that lists all trimesters of pregnancy by week.

Consider the most significant features and changes in the entire period of pregnancy by week of each trimester, while breaking down the entire period of expectation of the child as shown in the table.

1st trimester of pregnancy by week

1-3 weeks. The countdown of the beginning of the waiting period for the baby begins from the first day of the last menstruation. A little later, the egg is fertilized and the tiny embryo attaches to the walls of the uterus. You don't even know what's going on inside you while you're still waiting for your next period.

4-6 weeks. In the body of a woman, the hormone hCG is produced, during this period, most expectant mothers find out about their situation with the help of a pregnancy test. In a tiny embryo, a heart begins to form. Some women begin to experience malaise, as well as nausea in the morning.

7-10 weeks. The future baby is growing and developing rapidly, its weight is already about 4 grams. Mommy might put on some weight, however external changes not yet observed. Most girls fully suffer from toxicosis.

11-13 weeks. Time to pass, which includes ultrasound diagnostics and a biochemical blood test to determine the likelihood of possible chromosomal abnormalities in the fetus. Toxicosis, most likely, is already receding. The baby has formed the cardiovascular system, gastrointestinal tract, spine and face. By the end of the first trimester, his height reaches 10 cm, and his body weight is about 20 grams.

2nd trimester of pregnancy by week

14-17 weeks. The baby is actively moving in the mother's tummy, but most pregnant women do not yet feel this. The growth of the fetus reaches 15 cm, and the weight is about 140 grams. The expectant mother herself is also actively gaining weight, and by this time her increase can reach 5 kg.

18-20 weeks. During this period, most women get acquainted with the sensation of moving their baby. The tummy is already so prominent that it cannot be hidden from prying eyes. The baby develops by leaps and bounds, its weight reaches 300 grams, and its height is 25 cm.

21-23 weeks. At this time, you will have to undergo a second screening test. Very often, it is on the second ultrasound that the doctor can already determine the sex of the baby, whose weight reaches 500 grams.

24-27 weeks. The uterus becomes quite large, and the expectant mother may experience discomfort - a feeling of heartburn and heaviness in the stomach, cramps in the legs, etc. The baby occupied the entire uterine cavity, his weight already reaches 950 grams, and his height is 34 cm. His brain is fully formed .

3rd trimester of pregnancy by week

28-30 weeks. The load on the kidneys of a pregnant woman increases every day, the fetus develops incredibly rapidly - now it already weighs about 1500 grams, and its height reaches 39 cm. The baby's lungs begin to prepare for independent breathing.

31-33 weeks. During this period, you will undergo another ultrasound, on which the doctor will even be able to take photos of the baby's face. Its parameters reach 43 cm and 2 kg. The expectant mother is increasingly experiencing the body preparing for the upcoming birth.

34-36 weeks. All organs and systems of the baby are formed, and he is ready to be born, now until the due date he will only gain body weight. He becomes cramped in his mother's tummy, so the number of movements decreases. The weight of the fetus reaches 2.7 kg, height - 48 cm.

37-42 weeks. Usually during this period the logical end of pregnancy occurs - childbirth, the baby is born. Now he is already considered full-term, and the development of the lungs allows him to breathe on his own.

It is well known that a woman carries a child for 9 months, or approximately 280 days. In obstetric practice, the division of pregnancy into trimesters is accepted. How many trimesters are there in pregnancy? There are three of them, and in each trimester, the expectant mother and her baby expect pleasant changes and serious dangers. For the convenience of monitoring a pregnant woman, doctors use a pregnancy calendar by trimesters, and pregnancy trimesters are painted by weeks.

First trimester of pregnancy: 1-12 weeks

In the first trimester of pregnancy, the so-called pregnancy symptoms appear: the absence of regular menstruation, early toxicosis, etc. It is during this period that all the vital systems of the child are laid down, so it is so important to know how long the first trimester of pregnancy lasts, what dangers await mother and baby. Consider the first trimester of pregnancy week by week.

Your baby is growing

• 1-2 weeks - an egg develops in the body of the expectant mother, approximately at the end of the second week, ovulation and fertilization occur;
• 3 weeks - a fertilized egg reaches the uterus and is fixed in the endometrial layer;
• 4-5 weeks - the neural tube (the future central nervous system) is formed, the heart begins to beat;
• 6-7 weeks - the spine and cerebral hemispheres begin to form, the rudiments of eyes, auricles, arms and legs, liver, stomach, pancreas and thyroid glands appear;
• 8-9 weeks - all facial features are already distinguishable, genitals, intestines are formed, fingers appear on the hands;
• 10-12 weeks - the baby begins to move, nails appear on the fingers, and the rudiments of teeth appear in the gums. The heart is fully formed, and the endocrine system begins to produce hormones.

You are changing: around the 6th week of pregnancy, signs of toxicosis appear: morning sickness and vomiting. The chest swells and becomes sensitive, you visit the toilet more often - the growing uterus presses on the bladder. You get tired quickly, sleep a lot, often get irritated and cry. This is normal - your body is being rebuilt "in a pregnant way."

Important! Doctors consider the first trimester to be the most dangerous for the baby: any failure, infection, lack of vitamins or imbalance of hormones in the mother's body can lead to a miscarriage. Critical for a child are 3-4 weeks of pregnancy (when implantation of the fetal egg into the uterus occurs) and 8-12 weeks (during this period, the "hormonal storm" in a pregnant woman is especially strong).

Second trimester of pregnancy: 13-27 weeks

This time is considered the easiest and most pleasant period of pregnancy: toxicosis has receded, the tummy is just starting to grow, the tearful mood of the first weeks has been replaced by joyful expectation, I want to do a thousand things. It is in the second trimester that women really blossom.

Your baby is growing and very fast! If at the beginning of the second trimester his height is approximately 10 cm, and his weight is 30 g, then by the end of this period (27 weeks), the child weighs on average about 1.2 kg with a height of 35 cm! In addition, you can already determine the sex of the baby. The skeleton is fully formed, the muscular system and the brain are developing. The baby moves a lot, and at 18-22 weeks, the mother can already feel the first movements.

You are changing: your tummy becomes more and more prominent. Now is the time to get a "pregnant" wardrobe, and the doctor will advise you to wear a bandage (from 20-22 weeks). The only thing that can overshadow this wonderful period is pain in the back or hip joints.

Important! At this stage, genetic abnormalities and severe fetal malformations can be identified, so if you are at risk, be sure to take the “triple test”.

Third trimester of pregnancy: 28-40 weeks

This is the last trimester of pregnancy, the most difficult for the expectant mother: the weight and proportions of the body have changed so much that it is already difficult to walk, sleep and even breathe. In addition, the woman is overcome by fears, she again becomes emotional and irritable.

Your baby is growing all his organs are formed. The child already hears, makes respiratory movements, distinguishes taste. The head is covered with hairs, and the body is covered with a lubricant that will help to pass through the birth canal.

You are changing: the uterus continues to grow, and it is already difficult for you to breathe. False contractions may appear - the uterus begins to prepare for childbirth. You get tired quickly again, often run to the toilet, sleep poorly.

Important! At 28-32 weeks of pregnancy, signs of late toxicosis may appear: edema, increased blood pressure, rapid weight gain, protein in the urine.