Where does the fetus grow and develop? Twenty-four hours after fertilization, the egg divides into several cells and later turns into an embryo that remains in the uterus for forty weeks, i.e. about nine months. During pregnancy, the fetus grows and develops within several periods and phases, and this, the article will answer the question posed, and address the definition of the stages of fetal development in the first, second and third stages of pregnancy.
pregnancy
Pregnancy is the period that begins with the fertilization of the egg by the male sperm and continues until birth, during which time the fetus grows and develops in the mother’s womb until its development and growth are complete. In the mother's last menstrual period, not from the moment of conception, doctors often measure the gestational age in weeks, and a normal pregnancy lasts from 37 to 42 weeks.
Where does the fetus grow and develop?
Uterus _ _ During its descent from one fetus to another in terms of characteristics, including weight, shape, and various other characteristics, and at birth, the uterus expands greatly and needs time to return to normal.
Stages of fetal growth
The measurement of gestational age starts from the first day of the woman’s last menstrual period, which means that in the first two weeks of pregnancy the woman is not pregnant yet, and at the end of the second week the egg is released from one of the ovaries, and during intercourse, the sperm enters the vagina and then travels through the cervix And then from the uterus to the fallopian tube, where it meets the egg, so that the strongest sperm fertilizes the egg, and fertilization results, and the fertilized egg or what is known as the zygote is a few days in the fallopian tube and then moves to the uterus to implant there, and during those days the zygote divides several times To form a ball of cells called the blastocyst, after which the growth of the fetus begins inside the uterus as follows:
Fetal development stages in the first trimester
When the blastocyst reaches the uterus, it implants itself within the lining of the uterus, and the blastocyst is composed of an inner group of cells that make up the fetus, while the outer cells participate in the formation of part of the placenta that nourishes the fetus throughout pregnancy , and during the fifth week of pregnancy changes occur Hormonal, levels of estrogen and progesterone cause menstruation to stop, and during pregnancy from the sixth week, the rapid growth of the fetus occurs when the neural tube is closed in the back of the fetus, forming in turn the spinal cord and brain, and then the heart and other organs also begin to form, and at the same time the necessary structures are formed For the growth of the eyes and ears, and small buds appear on the sides, the arms and legs are formed later, and at the beginning of the seventh week, the head of the fetus begins to develop and the retina of the eye is initially formed, and during the eighth week the shape of the leg buds changes to take the form of paddles.
Fingers also begin to form, by the end of the week, and in this week, the length of the fetus is about 11-14 mm. The development of the eyelids and the outer ear, and at the beginning of the eleventh week, the fetus’s face is wide, the eyes are separated from each other, the ears are slightly lowered, the teeth and tooth buds begin to appear, and red blood cells begin to form inside the fetus’s liver and at the end of this week the external genitalia of the fetus begins to grow After 12 weeks, the nails of the fetus begin to appear, the face of the fetus becomes more developed, and the intestines grow in the abdomen. At the end of this stage of fetal growth, the length of the fetus is about 61 mm, and its weight is about 14 grams.
Watch also: When do the fetal heartbeat start and an explanation of the stages of the pulse development and the problems that may occur
Fetal development stages during the middle three months
In the fourth month of pregnancy, the fetal heartbeat can be heard using the Doppler device, and during this month the fingers and toes become well defined, as the eyelids, eyebrows, eyelashes, nails and hair become formed, and the teeth and bones becomeMore intense, and the nervous system begins to work, and the genitals are fully developed, and the doctor can see them with ultrasound to determine the sex of the fetus, and with the advent of the fifth month, the mother may begin to feel the movement of the fetus, and during this month hair begins to grow on the head of the fetus, and a type grows From the hair called fluff on the shoulders and back of the fetus to protect it, in addition to this, a white layer appears on the skin of the fetus, protecting it from exposure to the amniotic fluid, and by the sixth month, the skin of the fetus becomes wrinkled in red and the veins appear through it, and during this month the eyelids appear and begin to separate To open the eyes, the fetus may respond to sounds by moving or increasing the pulse, and by the end of the middle three months the fetus is about 30 cm long and weighs about 900 grams, and if it is born at birth at the end of this stage it is likely to live in intensive care.
The stages of fetal development in the last three months
At the beginning of the seventh month, the fetus continues to grow to fully develop its hearing, and the fetus stores fat stores in its body. During this month, the fetus frequently changes its position and responds to external stimuli such as sound, light, and pain. The fluid that surrounds the fetus begins to decrease from this month until the eighth month. The fetus continues to store fat stores and most of the internal body systems develop, and the brain of the fetus develops to be able to see and hear, and during the ninth month, the fetus continues to grow and the lungs develop almost completely, as coordination develops between the reactions of the fetus such as the eyes, head rotation, strong grasping and response For sound, light, and touch, the mother may notice that the fetus moves less due to space constraints, and at the end of this month the fetus’s position changes in preparation for labor and birth as the fetus falls into the pelvis with its head upside down, and the length of the fetus in this period is about 45-50 cm and weighs about 3.17 kg.
Finally, in this article, the question was answered, where does the fetus grow and develop? and the definition of the stages of fetal growth in the first, second and third phases of pregnancy was also addressed.
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