What are the stages of fetal development in the third month?

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What are the stages of fetal development in the third month?

What are the stages of fetal development in the third month?
What are the stages of fetal development in the third month?


The third month of pregnancy means the period between the ninth and thirteenth week of pregnancy, and it represents the end of the first trimester of pregnancy, and at the end of the third month of pregnancy, 

the weight of the fetus has reached about 28.35 grams, and its length is about 10.16 centimeters. 

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The necessity of starting prenatal examinations during the third month of pregnancy, in addition to the importance of ensuring that the necessary care is obtained during pregnancy.

ninth week

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By the ninth week of pregnancy, the fetus’s body parts and size will continue to grow and develop, and rapid changes will occur as well. that occur during the ninth week of pregnancy as follows:

  • The fetal skeleton begins to harden, coinciding with the formation of cartilage.
  • Nipples and hair follicles are forming.
  • The heart is divided into four main chambers.
  • The embryonic tail of the baby disappears.
  • Baby's delicate ears become more defined and will soon move into their correct position.

The development of the placenta continues, although the mother’s ovaries are responsible for the production of the hormone progesterone, which is necessary for the growth of the child until this stage of pregnancy, however, this stage will also witness the development of the placenta enough to start producing this hormone and supplying the baby with its need, and it will be The placenta is also able to deliver the nutrients the baby needs and remove waste products from the baby's body.

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  • The baby's legs are getting longer and more proportional to the rest of the body.
  • Show the knee and ankle joints.
  • The intestinal system is formed in the fetus's body, including the pancreas, bile ducts, gallbladder, and anus, and the intestines also expand.
  • The ankles and wrists develop more so that the fingers and toes become more visible, and the baby’s arms may be bent at the elbows, enabling them to settle on the baby’s chest, and they will meet together in later stages, and it can be said that during this week of pregnancy the arms and legs will move in the fetus Automatically due to the start of the development of small muscles, although the woman will not feel the slight movement of the fetus until at least another month or two. 
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  • Eyelids are forming, as the skin flaps on the eye begin to turn into eyelids, and will become more noticeable over the next few weeks.
  • The toes become visible, and although the child's head is large, his chin has not yet been completely formed.
  • The heart beats at a rate of 170 beats per minute.
  • The eyes increase in size and become more visible, and some pigment will appear in them.
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  • The mouth and tongue are shaped with small taste buds.
  • The fetal liver begins to manufacture blood cells.
  • The nose and sense of smell are developing, and this includes the development of the fetal rabbit's nose so that it can be seen.
  • The internal reproductive features begin to form; Including the testes and ovaries. 
  • The formed skin continues to be transparent, meaning that blood vessels can be seen through it.

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tenth week

By the end of the tenth week of pregnancy, the baby will already become a fetus, and many changes will occur during this week, the most prominent of which are as follows: 

  • Bones continue to develop and will appear white on ultrasound.
  • Eyelids continue to develop.
  • The testicles of a male fetus begin to produce the hormone testosterone.
  • The fetal brain is growing exponentially, with about 250,000 new neurons being produced every minute.
  • The fetus's head becomes more rounded.
  • The fetus can bend its elbows.
  • The fingers and toes are completely separated from each other, and the length of the toes and hands increases.
  • The umbilical cord becomes visible.
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  • The ears begin to develop from the side of the fetus's head, the ear canal is formed inside the head, the outer layer of the ear begins to take its shape, and the shape of the ears becomes close to the final image of them.
  • The features of the fetus's face become more distinct and clear.
  • The intestines become round.
  • The upper lip and both small nostrils become visible.
  • The jawbones develop and later will form the basis for bone formation.
  • The heart is fully formed, and its beats reach about 180 beats per minute.
  • The fetus creates jerky movements, which can be observed during an ultrasound.
  • The yolk sac will soon contract, and it is noteworthy that this sac takes over the task of providing the fetus with the nutrients it needs before the placenta develops.
  • Many vital organs begin to perform their functions, including the kidneys, intestines, brain, and liver, and the development of these organs will be completed in the later stages of pregnancy. 

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eleventh week

The head still constitutes about half the length of the fetus at the beginning of the eleventh week of pregnancy, however, the size of the child's body will increase later, and the most prominent features and other changes that occur during this week of pregnancy can be shown as follows: 

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  • The baby's face will be wide this week.
  • The eyes are separated from each other.
  • Eyelids become clearer.
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  • The baby's external genitalia begin to develop; This includes the development of the penis or the clitoris and the labia majora, 
  • although the external genitalia of males and females look somewhat similar until the end of the thirteenth week, and will become more visible during the fourteenth week.
  • The fetus will start breathing, and it will be able to open its mouth and swallow.
  • The hands and feet appear in front of the fetus's body.
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  • The nasal passages become open on the tip of the little nose.
  • The tongue and palate become visible in the mouth.
  • The nipples become visible.
  • Hair follicles are formed in all parts of the body; Including the crown of the head.
  • Fingernails and toenails begin to appear.
  • Teeth budding inside the gums.
  • The number and size of blood vessels in the placenta increase, enabling it to provide the baby with more nutrients.
  • The growth of the fetus's face continues with the increase in the size of the ears and their movement towards their final position on the sides of the head so that the ears take their almost final shape.
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  • The fetus's bones become more solid.
  • The skin of the fetus remains thin and transparent, but its transparency decreases with time.
  • The fetus begins to open and close its fists.
  • The heart, brain, and nervous system continue to develop.

twelfth week

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A certain set of screening tests can be performed for the first time during the twelfth week of the first trimester of pregnancy, which enables the detection of fetal infection with Down syndrome or Edwards syndrome. The pregnant woman for a blood test, and an ultrasound of the fetus, and the following is a statement of the most prominent features and changes that occur to the fetus during the twelfth week of pregnancy:

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  • Nails grow.
  • The face of the child becomes more developed.
  • The fetus begins to make random movements.
  • The fetus begins to concentrate iodine in the thyroid gland, and thyroid hormones will be produced around this time.
  • The pancreas begins to produce the hormone insulin.
  • This week, the heartbeat can be heard on the relevant electronic monitoring device.
  • The fetus fills the entire uterus.
  • The external genitalia is differentiated so that they become different and visible, whether they are male or female.
  • The eyes move to the front of the face.
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  • The eyelids remain closed to each other.
  • Fingers and toes become easily distinguishable, but they may be connected to each other by a network of the skin.
  • The vocal cords are formed in the fetus.
  • The fetus’s kidneys can perform their functions during this stage of pregnancy, and this is represented by the fetus’s ability to excrete the amniotic fluid surrounding it after swallowing it so that it is expelled by urine.
  • The intestine can make its way into the abdomen due to the presence of sufficient room for it.
  • The baby's hands are developing at a faster rate than his feet.
  • The fetus moves during this stage, although the woman will not be able to perceive its movement at this time.

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Thirteenth week

The fetus becomes fully complete at this stage of pregnancy so that the general body of the fetus is very similar to humans, and the size of the head in the third week is about a third of the size of the entire body, and the following is a statement of the most prominent features and changes that occur in the fetus during the thirteenth week From pregnancy: 

  • The fetus moves vigorously in the womb, Despite this, the woman will not feel the movement of the fetus yet, and over time, its rocking movements will turn into slower and more purposeful movements.
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  • The fetus can move its arms and legs.
  • The fetus can suck its thumb and form a fist.
  • The physiological hernia of the intestine is complete.
  • The fetal bladder becomes visible on ultrasound after the thirteenth week of pregnancy.
  • start certain members; Like the liver and pancreas in action, all the major organs are formed in the fetus's body, but it is still largely immature; It cannot survive outside the mother's womb. 
  • The vocal cords are developing in the fetus.
  • The fetus's bones become more solid.
  • Fine, curly hair begins to grow on the child's eyebrows and head.
  • Fingers and toes are completely separated from each other.
  • Nails begin to form.
  • The eyes of the fetus move in the position.
  • The wrists and ankles are well-shaped.
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  • Both the female's ovaries and the male testicles develop completely internally, and the penis and clitoris of the female fetus develop in the male fetus, but their size is too small to be seen when ultrasound is performed.
  • The child begins to form urine and release it into the amniotic sac, which forms the amniotic fluid, and it is worth noting that the fetus swallows the surrounding fluid and excretes it again, to continue this process continuously.
  • The fetus's skin remains transparent and thin, and the skin will thicken later.
  • The fetus's hands find their way into the child's mouth so that the fetus appears to be yawning or breathing.
  • The child sleeps at this stage for only a few minutes at a time, but the duration of sleep will increase in later periods, and a pattern or the emergence of a certain routine may be observed in this.

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The placenta continues to help the fetus develop; By providing it with its needed well-shaped nutrients, and ridding it of waste.

An overview of fetal development

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  • The growth and development of the fetus are the results of the complex interactions that occur between the possibilities of genetic growth, 
  • the development of the placenta, and the environment surrounding the mother, It is worth noting that the gestation period is 40 weeks, 
  • which is equivalent to 280 days, knowing that some women may reach a period of Pregnancy they have less or more than that, 
  • so experts estimate that childbirth may occur during the ninth to the tenth month of pregnancy, and the period of pregnancy is divided into three main stages, and therefore the first trimester includes the first trimester the first three months of pregnancy, 
  • while the second trimester includes the three months of The middle pregnancy and the rest of the pregnancy period, follows the third trimester of pregnancy, 
  • and the fetus goes through many changes during the period of its presence in the womb of its mother, bearing in mind that all the organs of the fetus will have been formed after the 12th week of pregnancy; 
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  • That is, about ten weeks after fertilization (in English: Fertilization); Except for the brain and spinal pregnancy, 
  • as they continue to form and develop throughout pregnancy, and it should be noted that the woman will notice the changes that occur in every third of pregnancy, 
  • and the doctor will discuss with the mother the changes that occur during each week of pregnancy, 
  • and the woman should discuss with the doctor any questions related to pregnancy, age, or due date.