The birth of a child is a very complex and responsible process. Every future mom wants to know how the development of the embryo takes place by weeks. After all, this action is reliably hidden from human eyes, but it has been carefully studied by scientists.
So, the development of the embryo by week
The first few hours after conception. The sperm penetrates the egg and the fertilization process occurs. Up to eight weeks, the resulting fetus is called an "embryo."
1-2 weeks . Active cell division occurs. The embryo moves along the fallopian tube, enters the uterus and by the end of the second week is fixed on its mucous membrane. The sex of the unborn child is already determined at this stage, and it depends on the set of chromosomes that contained the sperm, which fertilized the egg.
3-4 weeks . Despite the fact that the fetus is very tiny, his heart is already pulsating. The nervous system, bone and muscle, is gradually emerging. As a rule, during this period, a woman begins to guess about her pregnancy, since menstruation is absent.
5th week . The length of the embryo is about 6-9 millimeters. He has already developed the brain and spinal cord, the formation of the central nervous system. The heart is set free, hands, legs, a head with holes for the eyes, mouth and nose appear.
6th week . A placenta is formed. During this period, she serves the baby with the liver, lungs, kidneys, and stomach.
7th week . The embryo is already 12 millimeters long and weighs 1 gram. The fetus has its own vestibular apparatus and begins to move, but due to the tiny size, the woman does not feel any movement.
8th week . The development of the child by weeks of pregnancy proceeds dynamically and systematically. The embryo has already formed a body. You can distinguish a face, nose, auricles. The nervous system continues to improve and the skeleton grows. The first rudiments of the genital organs appear.
9th week . The whole body of the baby already has sensitivity. He can touch himself, the umbilical cord.
10-13 weeks . This stage is one of the most important in the process of intrauterine development, since the nervous system and most organs are actively developing. The fetus begins to make the first swallowing movements. As a result of the active development of the skeleton, its size is rapidly increasing, which entails the growth of the pregnant belly. During this period, the baby already hears, the vocal cords are formed.
14-16 weeks . The kidneys and bladder begin to function, the fetus takes its first breaths and exhalations, opens its eyes. Significantly increased
motor activity.17-20 weeks . Photos of the embryo by week during this period show that all parts of the body are already clearly visible. The kid opens his mouth, blinks. Due to the fact that its dimensions already exceed 14 centimeters, the expectant mother begins to feel light tremors.
21-25 weeks . The weight of the fetus is rapidly increasing, the first fat deposits appear. The baby's lungs are sufficiently developed, and in the event of his premature birth after 23 weeks there are great chances of survival with intensive care. The baby’s heartbeat begins to be heard if the ear is placed on the pregnant woman’s stomach.
26-30 weeks . The development of the embryo by weeks during this period is very active. So, a sucking reflex is formed, the first hairs on the head and eyelashes may appear, nails grow.
31-35 weeks. The baby's skin becomes thicker. During wakefulness, he opens his eyes, closes in a dream. The brain is actively developing, the number of convolutions is increasing. The lungs are fully formed, a grasping reflex develops.
36-40 weeks . The period of expectation and preparation of childbirth. Starting from this moment, you can expect the first fights - harbingers. The abdomen drops, the cervix is shortened. The body is preparing for childbirth. At this stage, the development of the embryo is completed by weeks. The kid calms down, pushes less, because of the considerable size he becomes cramped. From 38 weeks the baby is considered full-term.