What is a trimester during pregnancy. What you need to know about the trimesters of pregnancy by week, how to behave in the first, second and third? The state and feelings of a woman

15.07.2023

Motherhood is a huge responsibility, so in the process of bearing, mothers have a lot of questions. Every girl knows that the gestation period is conditionally divided into trimesters of pregnancy by weeks. This approach is very convenient for specialists and mothers themselves to navigate the deadlines and take into account their condition. Each trimester of pregnancy has its own characteristics and symptoms, characteristic changes in the fetus, the state of the pregnant woman, etc.

Newborn baby getting ready for bed after feeding

So, the conception happened and there are now nine months ahead, full of emotions and experiences, pleasant expectation, and sometimes fears. The entire period while the pregnancy lasts is subdivided into a certain number of weeks and trimesters of pregnancy. At the same time, pregnancy management by trimesters involves their division into a certain number of weeks.

Gynecologists calculate according to the obstetric method, while they begin to count the gestation period from the moment of the last menstruation, from the first day of the cycle. The pregnancy calendar for trimesters, as a rule, is built according to the obstetric principle. If we talk about the actual onset of conception, then it occurs 2-3 weeks later, but the exact day when fertilization occurs usually remains unknown.

The process of pregnancy takes a certain time. Immediately after fertilization, the cell goes to the uterine body, its route runs through the fallopian tube, and the implantation process takes a week or a little less, in fact, the egg is fixed to the uterine wall approximately 5-7 days after fertilization.

According to obstetric terms, the trimester schedule is 40 weeks, 280 days, 10 obstetric months, each of which consists of 28 days. There are three trimesters in total. Such a division is incredibly convenient for monitoring fetal development and the pregnant woman herself. To determine the PDR, an obstetric calculation method is also used, and in the future, the gestation period and the preliminary date of delivery are specified already with the help of delivery.

So, how many trimesters in pregnancy, we have already specified - there are three of them. How many weeks are in a trimester? This issue requires more detailed consideration.

The first trimester starts from the first obstetric week and lasts until the end of the 12th week of gestation. During this period, the formation of placental tissues takes place, the laying of all systems and organs of the future crumbs is carried out.
In the second trimester of pregnancy, which lasts from 13 to 27 weeks, there is an active growth of the fetus and its development.
The third stage is characterized by the beginning at the 28-week period. This stage lasts until delivery, it can last up to 41-43 weeks until the baby is born. At this stage of gestation, the fetus is actively preparing for childbirth and life is already separate from the mother's tummy. Also at this time, the internal organs of the baby ripen.

How are the trimesters of pregnancy distributed by week in the table.

Tracking the trimesters of pregnancy by weeks is very convenient for managing a pregnant woman, comparing the compliance of fetal development with accepted standards, etc.

Features of each period

When a mother discovers two stripes on the test, it is quite normal that she has a lot of questions, such as how to count the trimesters of pregnancy or how these periods are divided by weeks, the trimester of pregnancy is how much, etc. It is very important for doctors to know exactly which week of the term goes into mother at the moment. This makes it easier to detect any deviations or inconsistencies in fetal development.

But with regard to the division of trimesters into weeks, there are many contradictions, so such a division is considered to be very conditional. Weeks of pregnancy at each stage are characterized by a different number, i.e., the duration of trimesters varies by week. A different number of weeks is associated with the course of certain processes, for example, by the end of the first stage, the final laying of the fetal organs is completed, at the second stage they actively develop and the crumbs grow, and at the third, all organs ripen, the crumb is rapidly gaining weight and growing, preparing for new life outside of mother's belly.

The first stage of gestation

There are 12 weeks of pregnancy in the first trimester of pregnancy. They begin to count from the moment of the last menstruation, although in fact the conception is considered completed only after the implantation of a fertilized egg, that is, from about the third obstetric week. So, during this period, a new life is born. It is at this stage that an interesting position of the patient is discovered and the doctor can already determine the pregnancy by weeks.

During this period, mommy should be especially careful, because the threat of miscarriage is great. The slightest overload or nervous stress can disrupt implantation, which will lead to improper or insufficient fixation of the fetal egg. The most dangerous periods for a miscarriage are considered to be 3-4 and 8-12 weeks: a 3-4-week period means implantation processes, and 8-12 weeks are dangerous for pregnancy as a period of large-scale hormonal changes.

In the first trimester of pregnancy, mothers face such a condition as toxicosis, swelling of the mammary glands, excessive emotionality and sudden mood swings. The fetus develops quite quickly, because already at 4-5 weeks a tiny heart begins to beat. According to the table of pregnancy trimesters by weeks, the first stage of gestation ends with the twelfth week. And the baby by this time:

The cerebral hemispheres and vertebral structures are laid and formed;
Endocrine structures are already beginning to function actively;
The gender of the crumbs is already formed;
Tooth germs appear and tiny fingernails begin to grow;
Facial features are already being determined, the baby begins to move, only mom is not yet able to feel his motor activity, because the fetus is still too small.

By months, the end of this stage falls on the third or beginning of the fourth month of gestation. During this period, it is necessary to monitor the condition very meticulously. Sexual intimacy is not prohibited, because pregnancy is considered a physiological state, and not a pathology. But delicate and gentle sexual relations are recommended, the partner should avoid sharp pushes and deep penetrations. If spastic pain in the uterus or spotting suddenly appears, then the mother should immediately contact the antenatal clinic. By the way, by the end of the first stage, the girl should already be on obstetric records in the LCD.

Second

It is necessary to include a salad of greens and vegetables in the diet

In the second trimester of pregnancy, which begins at week 13 and ends at week 27, mommy experiences, perhaps, the happiest and calmest period of gestation. She finally managed to get pregnant, the signs of early toxicosis are already passing, the threat of interruption disappears, the tummy has not yet become noticeable, but is starting to grow slowly, and mommy is full of energy and enjoys life. Usually, at this time, the girls literally bloom, gradually, as the crumbs grow, the gait begins to change.

The enlarged uterus begins to press, displacing the rest of the pelvic organs, against the background of which trips to the toilet room become more frequent, heartburn may appear, constipation, etc., begin to disturb. But such manifestations are characteristic of the second half of this stage of gestation. Each girl is recommended to keep a gestation schedule, noting unusual sensations and new manifestations of an interesting position.

Now you should not avoid sexual intimacy with your spouse, because all the threats are behind, there is no toxicosis, so you can safely practice any poses, pampering your beloved man. This approach will only strengthen the marriage bond, and, therefore, bring the spouses together, but only in the absence of any individual contraindications for the pregnant woman. During this period, the first movements of the crumbs, felt by mommy, fall. The placenta, which was formed back in the days of the first trimester of pregnancy, now performs the functions of protecting the crumbs and providing it with the necessary nutrition and oxygen. But still, you should not allow bad habits, since any harmful effect can affect the baby.

Additional factors

At this stage, it's time to go to the dentist if you have problems with your teeth, as well as buy new clothes for your wardrobe and complete important matters at work. After all, very soon, in a matter of weeks, mommy will no longer be up to it.

You will have to fall in love with shoes without heels, because the tummy is growing rapidly, and the center of gravity is changing.
Also, during pregnancy, you will have to remove the thongs away, replacing them with ordinary cotton panties.
From about the 20th week, you can wear a special bandage that will relieve the load from the back, prevent the appearance of pain in the lumbar region and relieve the formation of stretch marks.
Now the amount of discharge may increase slightly, but you just need to make sure that there are no unpleasant itchy symptoms, blood impurities or an unpleasant odor.
Since the toxicosis has already passed, mothers often have an indefatigable appetite. You need to indulge your desires, but only in moderation, especially with regard to sweets and cakes.
The first felt movements may resemble light bubbles. But when the baby begins to move more clearly, then you need to be more attentive to his movements. Too intense tremors may indicate oxygen deficiency.

If earlier mom was forbidden to exercise in the pool or gym, now the doctor is likely to allow such classes so that mom can properly prepare the body for the last trimester and delivery. Mom now needs to walk more often in the air, and ventilate the apartment several times a day.

End of pregnancy

If there is no conception for a long time, you should consult a gynecologist

Dividing pregnancy into trimesters helps mothers navigate when unusual symptoms appear. Something for a particular period is considered the norm, and something is considered a dangerous sign, so mommy will be able to understand in time that not everything is in order with pregnancy. The beginning of the third trimester falls on the 28-29th week, and childbirth will become its logical conclusion. Doctors can calculate the preliminary day of delivery as much as they like, but the child will be born only when it is completely ready for this. Sometimes childbirth occurs even at 44 weeks.

Usually, already from the thirtieth week, the mother is on maternity leave, or even earlier, since such a long-awaited birth is inexorably approaching. Most often, delivery is scheduled for the fortieth week, however, not everyone gives birth on time, especially with multiple gestation. In fact, any diagnosis will show that the baby at the third stage of gestation from 36 weeks is already viable and will be able to live outside the mother's womb. But if the birth happened before 36 weeks, then special medical equipment is needed to get the baby out.

In fact, each trimester is equal to the quarters of the year, that is, it is three months. For the last, third quarter, the baby gains its final height, which can be about 49-52 cm. And its weight reaches about 3.5 kg. These parameters are approximate and are determined by genetic factors, lifestyle and diet in the last trimester before childbirth. It’s just that the main mass gain falls on the last 3 months, so it’s important to observe moderation in relation to food during this period, choose the right food.

What else do you need to know

Now doctors strongly recommend not to overeat and exclude sweets and desserts from the diet. Try to bring more movement into your life, although now they are a little more difficult than usual. At least walk more and wear a prenatal bandage. The baby already hears his mother perfectly and can be frightened by excessively loud sounds, so try to talk to him in a soft voice, and turn on the music quietly and preferably something from the classics.

Training contractions of the uterine walls are considered quite normal, helping the uterus to tune in and prepare for labor.
They are often confused with true contractions, but the latter are more intense and appear more and more often.
An early birth is indicated by a characteristic prolapse of the abdomen, in which the baby shifts down, lowers its head into the pelvic region and rests against the uterine fundus.
Also, a sign of early delivery is the discharge of the cervical mucous plug, which protects the entrance to the uterine cavity throughout pregnancy.

Now the main thing for mom is to ensure a quiet life, devoid of violent experiences and stressful situations. Sometimes this period is complicated by some unpleasant conditions that timely diagnosis reveals. These include the development of hemorrhoids, varicose veins, preeclampsia, etc. Therefore, it is important to undergo studies prescribed by a doctor.

Trimester analyzes

In order to identify probable deviations and exclude pregnancy pathologies, the mother periodically undergoes a series of studies and procedures during gestation. Blood tests determine the content of hCG, which, after implantation of the fetal egg, begins to rise, and if the increase occurs slightly, this may indicate an ectopic fixation of the embryo. They also donate blood for various infections such as AIDS, hepatitis, syphilis, and evaluate the Rh of the mother and father. Diagnostics also includes studies on pathology and antibodies like toxoplasmosis, rubella, herpesvirus or cytomegalovirus, etc.

When registering for obstetric registration in the LCD, you will need a medical examination by specialists such as a dentist, ophthalmologist, therapist, ENT specialist, etc. The first ultrasound examination is performed at 10-12 weeks, and the second at 20-24. On the second study, you can already see the floor of the crumbs, if he does not turn away and close from the sensor.

In the second trimester, the patient should be tested for TORCH infection. If a woman has not previously conceived, there have been miscarriages or fading, now they can prescribe triple testing for AFP, hCG and chorion. Thanks to this procedure, it is possible to timely detect such pathological features in the fetus as the presence of Down syndrome, etc. At the last stage of gestation, ultrasound is usually prescribed at 30-34 weeks. Specialists evaluate the readiness of the baby for birth, presentation, date of birth, blood flow between the uterus and the placenta, as well as fetoplacental circulation.

So, what are trimesters, what they are, we told. Each of these periods is characterized by its own characteristics. The main thing is that a girl needs to be as careful as possible during dangerous periods when there is a threat of miscarriage, and take all tests and ultrasound in time to prevent dangerous deviations and eliminate adverse factors.

The period of bearing a child is 9 months, 40 weeks or 280 days, during which mother and baby have to go through a difficult and difficult path before meeting each other. This period is usually divided into trimesters of pregnancy by weeks, each of which has its own characteristics and symptoms.

Trimesters of pregnancy: how to divide and count In obstetric practice, the entire period of bearing a child is divided into trimesters. Young women preparing to become mothers for the first time do not always understand the meaning of this term, asking questions - what are trimesters, and how many are there in pregnancy?

Do not worry, the trimester is a period of three months, making up 1/3 of the entire period of bearing a child. There are two ways to break down pregnancy into trimesters by week. In the first, simplified method, the maximum period of bearing a child (42 weeks) is divided into three equal parts, each of which includes 14 weeks.

The second method is more rational, according to doctors. Here, the calculation is based on 40 obstetric weeks, divided as follows:

I trimester - from the 1st to the 13th week
II trimester - from the 14th to the 27th week
III trimester - from the 28th week until the birth of the baby

The calculation of trimesters is carried out in order to make it easier and more convenient for obstetricians and expectant mothers to monitor the course of pregnancy, since each period has its own characteristics and symptoms, covering not one specific month, but a whole stage.

Pregnancy trimesters by week: table

Trimesters of pregnancy

In the table you can clearly see how the trimesters are divided and how to count them. It shows that the entire pregnancy is conditionally divided into three important periods, which include three calendar months each. These indicators are the same for each woman, therefore, they do not provide for any individual calculations.

The first trimester is the initial stage at which the conception and formation of the embryo occurs. Sometimes during this period, the expectant mother does not even suspect that a new life is emerging in her body. Most often, the first symptoms begin to appear by the 4th week: a woman notices a delay in the menstrual cycle, and her body reacts sharply to the appearance of a small “blazer” with malaise and nausea.

The second trimester is considered the most calm and prosperous period of the “interesting situation”. By this moment, the body of the expectant mother is fully adapted to the fact that you need to work for two, although the figure of a woman begins to change significantly - a belly appears, shapes are rounded, and the total weight increases.

By this stage, the embryo turns from a “tadpole” into a real little man: all the important organs and systems of vital activity are formed in him, he already knows how to move his arms and legs, suck his finger, bringing immense joy to the mother, who feels the movements of the baby in the stomach.

The third trimester is the most anxious and difficult period. It lasts from 7 months until delivery. At this stage, the woman's body is actively preparing for childbirth, and the baby continues to actively grow and develop. For the development of an infant, the last three months of intrauterine life are an important preparation for independent life, so a woman needs to make every effort to create favorable conditions for the baby to successfully pass the final period of formation.

Despite the fact that each trimester brings with it certain difficulties for the expectant mother, they are all wonderful and beautiful in their own way. Passing each section of the path before meeting with a child, a woman gains invaluable experience that cannot be bought for money.

Knowing what happens to the baby in the stomach in each of the trimesters and being aware of the characteristics of her body at a particular stage of pregnancy, the expectant mother will be able to prevent complications during childbirth, spend all 9 months in a positive mood.

Pregnancy trimesters (for weeks, the process of carrying a child by a woman was decided by gynecologists in the last century) is the result of the conditional division of 9 months of fetal formation in the mother's womb into periods, each of which lasts 3 months.

During all 3 trimesters, not only the physical development of a small person takes place, but also the constant transformation of the body of a pregnant woman. For the convenience of tracking the condition of expectant mothers, gynecologists have developed a number of standard indicators by which they assess the health of a woman and her child during a scheduled weekly examination.

The trimesters of pregnancy by week are shown in this table.

These assessment factors include:

fetal weight (determined by ultrasound);
body weight of a pregnant woman;
body length of the child;
the volume of the belly of the expectant mother;
the presence of edema in a woman, pain of a different nature, insomnia, and so on;
results of general urine and blood tests;
visual examination of the state of the cervix (in the absence of complaints from the future mother, it is performed by gynecologists only in the first and third trimester);
the heart rate of a small person in the womb;
blood pressure of a pregnant girl.

Thanks to generally accepted indicators, by deviation from them in each trimester, doctors can diagnose the onset of pathology in time and prevent it without harming the health of the mother and child. The most dangerous is the first trimester.

It is during this period that there is a high risk of sudden termination of pregnancy due to the inattentive attitude of the expectant mother to her body (pregnant women do not always find out about their situation from the first days, continue to lead a normal life, lifting weights, not devoting the proper amount of time to sleep, neglecting the principles of proper nutrition and so on).

Dividing pregnancy into trimesters, months, weeks

During these few weeks, ovulation occurs, the fertilization of the egg, as well as its “implantation” into the uterine wall, followed by laying the foundation for the further construction of the human body. The first trimester lasts until 12-13 weeks.

If no abortion occurred during this period, then, provided there are no pathologies in the woman’s health, the sudden loss of a child before the expected date of birth is unlikely. From week 13, the second trimester begins, which, by analogy with the first, has a duration of 3 months. At this time, the child is actively gaining weight and increasing in height, acquiring a human appearance.

At the second stage of pregnancy, a woman begins to feel the first movements of her baby, and also, in some cases, after a planned ultrasound examination, she can already find out her sex (in the second trimester, the child’s reproductive system is already fully formed, which allows the ultrasound doctor to visually guess who the woman is waiting for - boy or girl).

From the 28th week of pregnancy, the third trimester begins.

At the final stage of bearing a child, a woman usually begins to experience discomfort associated with a sharp increase in the load on her body (the weight of the child at the considered period already exceeds 2 kg, and the volume of blood required for normal nutrition of the placenta, which feeds the vital systems of the baby inside the womb, extremely large).

To simplify the perception of information about the division of pregnancy into periods, gynecologists recommend that expectant mothers use a generally accepted table.

Table:

Trimester	Months	weeks
1	first; second; third.	1 to 4; from 5 to 8; from 9 to 12-13.
2	fourth; fifth; sixth.	from 14 to 17; from 18 to 21; from 22 to 27.
3	seventh; eighth; ninth.	from 28 to 31; from 32 to 36; from 37 to 40.

Changes in the body of the expectant mother and child for each trimester

The trimesters of pregnancy (by weeks the child not only grows in size and increases its weight, but also acquires new skills necessary for later life outside the mother's womb) determine the condition of both the fetus and the pregnant woman.

Understanding what changes in the body are coming during the next trimester, the expectant mother will be able to mentally prepare herself for possible difficulties and make every effort to prevent discomfort.

Trimester	Changes in the body of a pregnant woman	Changes in the child's body
1	the occurrence of signs of toxicosis, most often manifested already at 5-7 weeks of pregnancy (nausea, vomiting, changes in taste preferences; dizziness); increase in breast size; an increase in the sensitivity of the mammary glands (in some cases, at this stage of bearing a child, pregnant women complain of pain and a feeling of fullness of the chest); increased urge to urinate (the uterus with an "implanted" fetus presses on the bladder); drowsiness; excessive fatigue; excessive emotionality caused by hormonal changes.	formation of the neural tube (the basis for the future central nervous system); the heart muscle begins to function; the beginning of the formation of the spinal column, the brain and its hemispheres, in particular; laying the foundations for the future formation of the eyes, auricles, limbs, organs of the gastrointestinal tract and thyroid gland; the formation of genital organs, fingers on the upper and lower extremities; the beginning of the production of hormones by the endocrine system, as well as the laying of the rudiments of milk teeth in the gums; the baby begins to move inside the mother's womb.
2	an increase in the size of the abdomen; possible occurrence of pain in the lumbar region and thoracic spine; discomfort in the hip joints; the likelihood of developing varicose veins (due to rapidly growing weight).	increase in height and body weight; the end of the formation of the sexual and skeletal systems of the child's body; active development of muscles and brain; increase in motor activity.
3	increase in the size of the uterus to its maximum size; difficulty breathing associated with increased pressure from below on the organs of the respiratory system; sleep disorders; frequent urge to urinate; excessive fatigue; the occurrence of "false contractions" (a kind of preparation of the uterus for the upcoming labor activity).	the final formation of all vital organs and systems of the body; improving the ability to perceive information through hearing and produce respiratory movements; the appearance of taste perception; active hair growth on the head; the formation of a lubricant throughout the body, designed to facilitate the passage of the child through the birth canal at the time of birth.

Fetal development by weeks and months

Tracking how the fetus develops each month or week of pregnancy helps to reduce the general anxiety of the expectant mother, as well as strengthen her parental feelings regarding her child.

First trimester

Table:

A week
1 — 2	Based on the fact that the first day of the menstrual cycle is considered to be the beginning of pregnancy, the first two weeks of bearing a child are conditional, since the actual conception has not yet occurred.
3	The fertilization of the egg occurs, as a result of which the color of the eyes and hair of the unborn child is determined at the gene level. The egg begins its division and moves towards the uterus.
4 (end of 1 month of pregnancy)	The fertilized cell implants in the uterus and grows to the size of poppy seeds.
5	The embryo grows up to 2-3 mm in length, while acquiring two poles, where the lower and upper limbs will begin to form in the future. 3 functional layers are formed, which are the basis for the further formation of the vital systems of the body of a small person. The neural tube appears.
6	The formation of the upper and lower limbs of the child and the increase in the growth of the embryo.
7	Increasing the size of the embryo to the proportions of a blackcurrant or raspberry. The division of the child's brain into 3 functional sections. Active shaping of the limbs and laying the foundations for the formation of the ears and nose.
8 (end of 2 months of pregnancy)	Formation of external facial features, limbs and vital organs. The beginning of the motor activity of the fetus.
9	An increase in the size of the embryo to the dimensions of the fruit of a plum tree. The formation of the reproductive system of a small person.
10	Active development of the brain. The film membrane between the fingers of the upper and lower extremities disappears. Increasing the strength of the skeletal system.
11	An increase in the size of the fetus and its weight. The gradual acquisition by his body of a human proportional form.
12	The baby grows to the size of a small orange. The external genitalia are formed. Nail plates appear on the fingers and toes.
13 (end of 3rd month of pregnancy and first trimester)	The brain regions and organs of vision of the child are actively developing. In the gums of the baby, the rudiments of milk teeth appear. Hair slowly starts to grow on the head.

Second trimester

Table:

A week	Development of the fetus at a particular stage of pregnancy
14	The endocrine system starts producing hormones. Increases the strength of the chest. As the formation of the upper palate in the child's mouth finishes, he acquires a sucking reflex.
15	The production of specific proteins of a particular blood type begins. The emergence of skills to change facial expressions. Motor activity increases (the expectant mother most often does not yet feel the movements of the fetus).
16	There is an active weight gain, mucous membranes are formed. If the fetus borne by a woman is a girl, then at week 16, the little man will begin to form his own eggs - the basis for the reproductive system.
17 (end of 4 months pregnant)	The first fat deposits appear under the skin of the child. He is actively increasing his height and weight while continuing to practice high physical activity.
18	The emergence of the ability to perceive the world around us through the organs of hearing. The formation of an emotional connection between a small person and his parents begins (the child gets used to their voices, hears the mother's heartbeat, and so on).
19	Under the rudiments of milk teeth, molars begin to form. A special mucus appears on the child's body, which contributes to proper thermoregulation.
20	The final formation of the facial features of the child. The emergence of taste perception.
21 (end of 5th month of pregnancy)	The skeletal system develops actively and the bone marrow begins to function.
22	Change in the color of the skin (becomes whitish). Hairs form on the face (in particular, eyebrows and eyelashes).
23	The brain and central nervous system are actively developing. The end of the formation of vital organs.
24	The end of the formation of the organs of visual perception, despite the continued absence of pigment (colorless eyes). The child begins to practice a variety of movements, thus studying his body.
25 (end of 6th month of pregnancy and 2nd trimester)	Maturation of the gastrointestinal tract and the formation of meconium in the intestine.

third trimester

Table:

A week	Development of the fetus at a particular stage of pregnancy
26	The child forms his own daily regimen, which does not depend on the time of wakefulness and rest of the expectant mother. The respiratory organs are actively formed, preparing for functioning outside the mother's womb.
27	The child learns to open and close his eyes in response to bright light. The baby calms down and falls asleep when gently rocking (a pregnant woman at this time can be in public transport, walk or do household chores). The amount of hormones produced increases.
28	Increase in height and weight.
29 (end of 7th month of pregnancy)	Active development of the brain. A child during sleep begins to dream, he has emotions - he learns to be scared and enjoy.
30	The child begins to actively convey to the mother his attitude to external circumstances. For example, he may start kicking if a woman is near the source of the noise.
31	The child increases in all respects, while simultaneously reducing his physical activity.
32	The fetus is located as it will lie in the mother's abdomen until the moment of birth, which determines the type of upcoming labor activity (natural childbirth or Caesarean section).
33 (end of 8th month of pregnancy)	The child begins to adapt to the daily routine of his mother, repeating after her periods of activity and rest.
34	The end of the formation of the respiratory organs.
35	A significant increase in the weight of the child. Lubrication on the body acquires a thicker consistency, which will help a small person to overcome the birth canal less painfully.
36	The final stage of the formation of the nervous and immune systems. Subcutaneous fat accumulates.
37	The end of the formation of all systems and organs of the child's body.
38 - 40 (end of 9th month of pregnancy)	With head presentation, the baby's head falls into the pelvis of a pregnant woman, which is a sign of the body's readiness for the upcoming birth.

Feelings of a woman as the fetus develops

Pregnancy trimesters by weeks of child development determine not only the physical, but also the emotional state of the expectant mother. In the first trimester, a pregnant woman is overcome by manifestations of toxicosis (nausea, vomiting, dizziness). Most women lose a lot of weight in the first months and do not yet feel emotional attachment to their child.

Due to hormonal changes in the body, they often cry, laugh for no reason, become more irritable and require increased attention.

As the fetus develops, by the second trimester, toxicosis ends, and the stomach becomes rounded and increases in size, which allows the woman to begin to enjoy her position. The psychological background is evened out and an emotional connection with a small person in the stomach is born (usually it is especially enhanced after the first sensation of the expectant mother of her baby's jolts).

In the third trimester, despite the recurring physical discomfort (swelling, insomnia, frequent urge to urinate), the expectant mother is stable in her emotions, looking forward to meeting her child and enjoying pregnancy. At this stage, girls usually visit a 3D ultrasound in order to take a photo of the baby as a keepsake of the period of his stay in the womb.

Possible deviations

Pregnancy lays the foundation for the future health of the little person. Knowing what abnormalities can be identified in a particular week of intrauterine life of the fetus, the expectant mother will be able to prevent their occurrence by adjusting her lifestyle in each trimester.

Most often, doctors during pregnancy are diagnosed with:

down syndrome(a chromosomal mutation leading to dementia and a serious delay in the development of the child);
patau syndrome(a genetic mutation whose owners rarely live longer than a year. It provokes deafness, mental retardation and a number of other serious pathologies);
heart disease(some of them are subject to surgical correction, others allow a person to live, forgetting about their existence);
developmental pathologies of limbs or vital organs(they are not congenital and occur at the stage of laying the foundations of body systems during pregnancy).