Pregnancy week by week: symptoms and formation of the baby!

Know everything about pregnancy week by week because this is a magical time for a woman who wants to be a mother is when her body begins to create life, when nature gives her the power to create a new being in her belly. Pregnancy lasts approximately 40 weeks, and while each week is different from one woman to another, it’s important to know what happens in each trimester and track your pregnancy week by week to find out not only how a woman’s body changes, but also what it is. the development of the embryo, then the fetus, and finally the baby, which grows in the mother’s womb.

The physical changes of the mother and the development of the fetus is very important, it is also important to take other aspects into account, such as emotional changes that occur because of the turbulence of hormones that a woman undergoes during the nine months of Pregnancy.

Then you will be able to know what are the changes in the woman’s body, in the evolution of the future baby, as well as the emotional changes that must be taken into account.

How to know if I’m pregnant? The first symptoms of pregnancy are very important to give you clues about whether you are pregnant, when you suspect it and if the pregnancy test has not confirmed it. If you want to find out as soon as possible if you have become pregnant, watch out for these early pregnancy symptoms.

Frequent pregnancy symptoms:

1. Delayed period:

If your menstrual cycle is regular and you are suddenly late, you should be careful. It can be a simple, unimportant delay, but it can also be the first symptom of pregnancy.

2. Hormonal changes:

They can occur in the most diverse ways, from mood swings to armpit spots .

3. Small blood loss:

Some women get some blood in their vagina about twelve days after becoming pregnant. It’s a very small amount and doesn’t last more than a few days. The reason for this small blood loss is not known, but it could be due to implantation of the fertilized egg inside the uterus. If this happens to you, you should consult the gynecologist.

4. You want to urinate frequently:

After six weeks of pregnancy, you may start to feel the urge to urinate more often. It is also one of the most frequent symptoms of pregnancy. The main reason is that during pregnancy, the amount of blood and fluid circulating in the body increases and the kidneys work harder.

5. Abdominal swelling:

Another of the pregnancy symptoms is the hormonal changes that occur in early pregnancy, which can make you feel bloated, similar to the days before your period arrives.

6. Tightness and pain in the breasts:

The breasts can swell, increase in size and show special sensitivity, due to the increase in progesterone and estrogen. This pregnancy symptom manifests itself a few days after conception. However, breast swelling can be a symptom of menstruation, soon to come, rather than a sign of pregnancy.

7. Nausea and vomiting:

In most cases, pregnancy nausea doesn’t start until a month after you become pregnant, although you may feel it sooner. Nausea and vomiting typical of pregnancy can occur at any time of day and is a clear symptom of pregnancy.

8. Aversion to some smells and flavors:

When you become pregnant, certain odors can make you nauseous and even cause nausea. It could be due to the rapid increase in estrogen levels in the body. The same can happen with food: things you used to love that now reject you. It can also produce a change in the perception of flavors and profuse salivation. These pregnancy symptoms will manifest between the second and eighth week of conception.

9. Tiredness and drowsiness:

In early pregnancy, fatigue often occurs, possibly due to an increase in the levels of the hormone progesterone. During the second trimester of pregnancy, energy is regained, and towards the end of the pregnancy period, fatigue reappears.

10. Increase in body temperature:

Although, this change could be due to a cold or other such disorders.

11. Constipation:

The high concentration of progesterone, responsible for relaxing muscle tone, also causes a slowdown in bowel activity. And then constipation appears, other more frequent pregnancy symptoms. To combat this, it is advisable to drink a lot, eat a good amount of fruits and vegetables and do some movements: even simple and regular walks are enough to stimulate intestinal activity.

Pregnancy week by week:

The approximate duration of pregnancy is 280 days of gestation, or 38 weeks from the time of fertilization of the egg and 40 weeks from the date of the last menstrual period (FUM).

Then we’ll take a fascinating journey through pregnancy week by week , from the moment of conception to the day of birth. You can find out how your baby grows and the changes that happen in the mother’s body during pregnancy.

1st week of pregnancy:

Week 1 of pregnancy you are not actually pregnant yet, since during that week you will have your period.

Vaginal bleeding occurs due to shedding of the functional layer of the endometrium that has been prepared to accommodate the fertilized egg. Because there is no fertilized egg, menstruation occurs.

It is the pre-ovulatory stage, which varies from one woman to another, which begins on the first day of the period.

2nd week of pregnancy:

In the second week of pregnancy, the body prepares for ovulation that will occur, depending on each woman, this week or later. It will release the egg that will be fertilized by a sperm that will give rise to new life.

Fertile days are the days when you have a better chance of getting pregnant. Women’s cycles usually cover 28 or 30 days, so the central days of the cycle are the most favorable for getting pregnant: 14 or 15 days after the first day of menstruation.

3rd week of pregnancy:

In the  week-by-week pregnancy  follow-up, at the 3rd week, the magic moment of fertilization takes place. It’s really when you’re pregnant.

The first sperm that reaches the egg penetrates the external barrier until it enters its nucleus and reaches the fertilization that gives rise to a new being.

The moment both gametes are fused, each contributing its 23 chromosomes, there is a unique genetic combination that determines the baby’s DNA and, of course, its sex.

4th week of pregnancy:

In the fourth week of pregnancy, four to seven days after fertilization, implantation of the embryo takes place in the walls of the uterus, where it will continue to develop until the day of its birth.

Sometimes, when the embryo is implanted in the uterus, the endometrial tissue is eroded, producing light bleeding that, coinciding with the time when menstruation is due to fall, can be mistaken for menstruation. This bleeding is known as implantation bleeding.

5th week of pregnancy:

If you still haven’t felt the first symptoms of pregnancy, chances are you’ll start to notice it now in week 5 of your pregnancy along with missing your period. Swelling and tenderness of the breasts, nausea, desire to urinate frequently, fatigue and drowsiness… are some of the signs that you are pregnant.

Period has not arrived, a week late (in regular cycles) it’s time to take the pregnancy test if you haven’t done so before.

This week the embryo is just three weeks old (corresponding to week 5 of pregnancy) and is about a millimeter wide and four to five millimeters long. It already begins to have more differentiated parts in its characteristic “C” shape: it differentiates the top and bottom, left and right, front and back.

6th week of pregnancy:

In the  week-by-week pregnancy follow-up,  around week 6 of pregnancy, the embryo’s heart begins to beat regularly, although it is likely not detected on ultrasound.

Make spontaneous movements, but there are still many weeks to start noticing them, because at the moment we are talking about a small embryo of a few millimeters: it measures about a centimeter in length.

7th week of pregnancy:

In the  week-by-week pregnancy follow-up,  at week 7 of pregnancy, the embryo is about a centimeter long and weighs less than a gram. The buds or shoots of arms, the hand plate and the lower end in the form of a spade are made visible. The brain is transformed into five areas and some cranial nerves are visible.

We are in the period of organogenesis, because the organs of the body are being formed from the different layers of the embryo. Exposure of the embryo to teratogens (agents that can induce or increase the potential for congenital malformations) during these weeks (4-8) is the most critical period of development.

8th week of pregnancy:

The embryo at week 8 of pregnancy has an age of 6 weeks since fertilization took place. The length from the crown to the buttocks is about 15-20 millimeters and the weight is about three grams. And although it is so small, it is already extremely complex.

The external appearance of the embryo was modified by the formation of the brain, liver, somites, limbs, ears and eyes. At this point we can say that it already has characteristics that give it a human aspect.

9th week of pregnancy:

The embryo at week 9 of pregnancy continues to develop, change and grow. It is already the size of a grape, about two and a half centimeters. There is still very little to notice, but for him, the growth is dizzying. The tail at the end of his back disappears: our son is looking more and more like a human being.

The embryo can now move, although it does so involuntarily. The development of your nervous system increases and sometimes, as I said, the embryo is not wanted, but it can be detected that it shakes. Your brain doesn’t control these movements, but they are spasms that indicate you’re forming connections correctly.

10th week of pregnancy:

In the  week-by-week pregnancy follow-up,  arriving at week 10 of pregnancy, there is a change in the way the baby is called. When the tenth week of pregnancy ends, we stop using the word embryo to call a fetus.

Now all your organs have been formed and your heart, brain, liver, kidneys and intestines are working. They will grow and develop continuously until birth, but it is already possible to recognize them perfectly defined.

11th week of pregnancy:

In the  week-by-week pregnancy follow-up,  at 11 weeks of pregnancy, the baby weighs approximately 8 grams and measures between 4 and 6 centimeters.

His fingers are already parted, the membranes that joined them are gone. Although your head is still half of your body, it’s completely normal at this point. The ears are migrating to the final position and the little one can open and close his hands.

12th week of pregnancy:

In the  week-by-week pregnancy follow-up,  up to the 12th week of pregnancy, the first ultrasound should ideally be scheduled, although a first ultrasound will be done to confirm the pregnancy.

Our baby, at week 12 of pregnancy, is already the size of a kiwi. It will measure 6 centimeters and weigh about 14 grams, we could make a crib in the palm of your hand.

He doesn’t stop moving, kicking and shaking his arms and head, already perfectly formed, it even looks like he was propelling himself by touching the walls of the uterus with his feet.

13th week of pregnancy:

In the  pregnancy follow-up week by week,  reaching the 13th week of pregnancy, your head is still disproportionate, but each time we will see how the relative size is more balanced in relation to the rest of the body.

Baby’s fingers are already perfectly separated, he has flexibility in his knees and elbows and he can even suck his little finger perfectly.

The intestines are already inside the body, inside the fetus’s abdomen and not inside the umbilical cord.

14th week of pregnancy:

At 14 weeks pregnant, she weighs about 30 grams and measures about 10 centimeters. It looks like a miniature baby.

His facial features are becoming more and more evident and we could even see how he gestures with the muscles of his face, he sucks his thumb and his little hand.

He drinks amniotic fluid and pees inside his belly, shakes his arms and legs and seems to be happy in his intrauterine life.

15th week of pregnancy:

As of this week, the skin, which is practically transparent, begins to cover the lanugo, a layer of very fine hair that we see at birth and as you may have heard or I have already said, is normal and then falls out. by myself.

The eyes are getting closer to the position they will finally be in, and although they are still closed, they are starting to become sensitive to the changes in light passing through the belly. The ears begin to have some of their characteristic folds.

16th week of pregnancy:

In the follow-up of the  pregnancy week by week,  at the 16th week, it measures between 10 and 11 cm. The legs are longer than the arms and some joints begin to differentiate, such as knees, ankles, elbows and wrists.

He begins to open his fingers and also begins to close them in what appears to be the beginning of the grip reflex. Thanks to him, he begins to lift his feet, the umbilical cord or his hands, one with the other. Nails also appear on the hands and feet.

17th week of pregnancy:

In the follow-up of  pregnancy week by week,  reaching the 17th week of pregnancy, when the baby forms at 15 weeks, it measures 11-13 cm and weighs about 100 grams.

It continues to grow and above all its legs, as the head now grows less. Under your skin, a layer of fatty tissue begins to form that will serve to protect you from the cold. Your hearing is more developed and may move abruptly if there are loud sounds outside.

18th week of pregnancy:

In the  week-by-week pregnancy follow-up,  at week 18 of pregnancy, it measures about 13-15 cm and weighs about 150 grams. His femur is about 2.7 cm and the circumference of his head is about 15.4 cm.

The heart matures, being divided by the two atria and the two ventricles. The atria still communicate with each other, passing blood from right to left through the so-called foramen ovale, as a measure to prevent the passage of blood to the lungs. The moment the baby is born, when he has to start using them and starts breathing, that hole closes up.

19th week of pregnancy:

His head, arms and legs are now proportioned to the rest of his body and hair has started to grow on his head. The ears and eyes are almost in their final position.

It’s amazing, but if you’re expecting a girl, your tiny ovaries that won’t be bigger than a bud already contain primitive eggs that will give birth to the eggs.

20th week of pregnancy:

In the  week-by-week pregnancy follow-up,  at week 20 of pregnancy, the baby measures 16 centimeters and weighs about 350 grams.

Your lungs begin to practice breathing exercises and your digestive system does the same by swallowing amniotic fluid. Your brain quickly develops areas for the senses and already has 30 billion neurons.

Around the 20th week of pregnancy, a high-resolution ultrasound called morphological ultrasound is performed , which is of great importance in prenatal care. The specialist doctor performs a thorough analysis of the baby’s organs to detect possible malformations, although not with 100% reliability.

21st week of pregnancy:

It already moves vigorously inside your intestines making you notice it with kicks, stretches and twists that they do inside the uterus, where you still have room to move comfortably.

It moves about 50 times an hour, but the moment you notice its movements the most is when you lie down to rest, especially if you’ve eaten before, the baby is activated. During the day, when you are also moving, you cannot feel much.

22nd week of pregnancy:

In the  week-by-week pregnancy follow-up,  arriving at week 22 of pregnancy (20 weeks from conception), your baby measures 27 centimeters and weighs almost 500 grams.

You can see her eyelids, nails and eyebrows, although the latter are still colorless, they are white fluffs that are seen above her eyes.

Looking at it, it looks almost like a full-term baby, but still needs to gain weight. Your body fat represents 1% of your body, but from now on you will be gaining layers of fat, which will help regulate your body temperature.

23rd week of pregnancy:

You may notice that your skin is a thin layer that covers your body but is no longer translucent but starts to look red and wrinkled. The layers of fat will be deposited under the skin.

His eyes are completing their development, although his color is not yet the color he will be born with, because his iris is not pigmented. It won’t even be the definitive color, as up to approximately six months and up to the first year of life it cannot be defined.

24th week of pregnancy:

Your baby is now about 30 cm in total (about 21-21 cm from head to chest) and weighs about 600-700 grams approximately. He is increasingly likely to survive in the event of premature birth, as the lungs begin to produce the pulmonary surfactant that would allow him to breathe outside the uterus.

Your baby still has plenty of space in the uterus and can move freely and change positions frequently. Although he still sleeps around twenty hours a day, he has frequent brief periods of activity where he will do more and more joint flips.

25th week of pregnancy:

In the  week-by-week pregnancy  follow-up, at week 25, the baby already measures about 34 cm in total, about 22 cm from the head to the bottom, and weighs between 700 and 800 grams. His hair starts to be defined and has a certain color and texture, although these can still change when he is born.

Although your eye color is not completely defined, as you need light for the pigments to eventually form, your baby already has eyelashes and can open and close their eyes. His hearing continues to develop rapidly and you may be able to perceive sounds both from the outside and those he makes when he moves in your uterus.

26th week of pregnancy:

As she continues to have room in the uterus to float and move, she is quite active and coordinates her movements better. On ultrasounds, you can see him “pedaling” with his legs and pressing against the uterine wall with his feet. The fists also have more strength and can catch the cord.

Although it is not very common, the kicks may even hurt the ribs, in which case it is better to change positions, lying on your side.

27th week of pregnancy:

In the  week-by-week pregnancy follow-up,  at week 27 the baby is still very thin, although from now on he accumulates more fat and gains considerable weight. The length from the crown to the buttocks would be about 24 centimeters (about 36 centimeters in total), and the weight is close to reaching one kilogram.

Starting this week, the baby is more likely to survive if he is born prematurely. But there are 13 weeks left until the end of the pregnancy, so it continues to develop.

28th week of pregnancy:

The fetus already measures about 26 centimeters from the crown to the buttocks (about 36 centimeters in total) and weighs about 1100 grams. He would already have a chance of surviving in the event of a premature birth, although his lungs that are just starting to work are not yet ready to breathe air and his body temperature regulation is deficient.

The brain growth during this month is spectacular, the fetus feels more and more stimuli from the inside and those that come attenuated from the outside.

29th week of pregnancy:

The accumulation of fat continues and the baby is large enough to determine its presentation, that is, its orientation in the uterus (breech or cephalic). However, you will still have time to change this position during the next month.

The adrenal glands of the fetus produce circulating androgenic substances in the blood and reach the placenta to become estrogen (estriol), to stimulate the production of prolactin in the mother’s body (and the breasts are prepared to give breast to the baby).

30th week of pregnancy:

The bones are already developed, but they are still soft and flexible. To endow them firmly, the baby begins to store Iron , Calcium and Phosphorus .

Now you can differentiate between sweet and savory flavors. Your respiratory system continues to mature, and in fact, your baby tests breathing movements and hiccups each day. But above all the biggest change you will find in the baby’s maturation is the nervous system.

31st week of pregnancy:

The lungs are practically formed, although they cannot even breathe outside the mother. Your skeleton is in full growth and your bones continue to store Iron , Calcium and Phosphorus ..

You can turn your head and “see”, not only distinguish light from darkness and your kidneys are fully functional and already eliminate more than half a liter of urine a day.

32nd week of pregnancy:

Your baby’s brain is practically formed and this goes on  week to week in pregnancy,  so much so that many doctors see no difference between the brain of a newborn and a child at 32 weeks. Their weight is around 1900 grams and their height is around 42 centimeters and if born at this time they would have an 85% chance of survival, but their lungs are not yet mature.

33rd week of pregnancy:

In the week-by-week pregnancy follow-up,  this week it is possible that, if you have not yet turned to put yourself in the cephalic position, you will do so or begin to “think” about doing so. Now he still can, but in a few weeks his size will make the turn more difficult.

Fetuses of this age have been seen to make rapid eye movements (REM) which are like those we do when we dream. For this reason, fetuses at 33 weeks are believed to already dream when they sleep. The question we are sure we all ask is: what do they dream of? And there’s no answer, obviously, because it’s impossible to know.

34th week of pregnancy:

The baby measures approximately 46 centimeters and weighs about 2,200 grams. His lungs are almost fully formed and his bones have hardened but are still very flexible, including those in his head.

His skull is not yet completely closed, which allows him to more easily adapt to the birth canal at birth. Therefore, some babies are born with a cone-shaped or crushed head, but this reverses within a few days of birth.

35th week of pregnancy:

In the  week-by-week pregnancy follow-up,  at week 35 your baby already measures about 46 cm from head to toe and weighs about 2,500 grams. The skin starts to smooth, it starts to deposit fat and the lanugo starts to disappear.

Your kidneys are now fully developed and your liver is also starting to function. Most of your basic physical development is now complete. In the next few weeks he will be dedicated to gaining weight.

36th week of pregnancy:

Your baby’s skin is turning pinker due to the accumulation of fat and in most cases it will already be upside down and embedded. He’s also losing the fur that covered him and the vernix caseosa, which is a creamy, whitish substance that covered his skin the entire time he was inside you. All of this will be swallowed and that is what will form the meconium, which will be the baby’s first stool (it’s a very sticky black paste).

37th week of pregnancy:

In the  week-by-week pregnancy follow-up,  by week 37 of pregnancy your baby measures approximately 46-48 cm and weighs approximately 2,900 grams. His femur is now about 7.2 cm and the circumference of his head is about 33 cm.

If everything has gone according to plan, at this point you will be in a cephalic position, that is, face down, ready to be born. As the baby is already formed, what happens inside the belly is an increase in height and weight to obtain better conditions, in addition to continuing to receive the mother’s immune cells. It is estimated that, in addition, it increases about 15 grams of fat per day, which will serve to better regulate the outside temperature.

38th week of pregnancy:

Your baby is about 50 centimeters tall and weighs about 3,200 kilograms. His little hands can already squeeze, in fact he already does with the umbilical cord that has been his toy inside the uterus.

Its head is covered in hair and looks like it will be born. Some babies are born with a lot of hair while others are born almost naked, but it’s something that can later be reversed. The hair they are born with tends to fall out during the first few months of life.

39th week of pregnancy:

In the  week-by-week pregnancy follow-up,  up to week 39 of pregnancy, the length of the baby is approximately 36 centimeters from the crown to the buttocks (about 52 centimeters in total) and the weight is around 3250-3300 grams.

It continues to receive many nutrients from the mother through the umbilical cord, which is about 1.3 centimeters thick. Antibodies also cross the placental barrier and bolster the baby’s immune system when he is born, and continue to accumulate fat.

40th week of pregnancy:

You will finally meet your baby! How is it going to be? When the baby is born, it has a purple color, perhaps pink or yellow. The skin appears to be covered with waxy varnish, remnants of blood and lanugo… The high levels of hormones make your genitals look swollen.

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Maybe the head has something deformed from having passed through the birth canal, but it’s normal and little by little the baby’s head will take its final shape.

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