What to eat during week 9 pregnancy ultrasound,pregnancy complications over 40 weeks risks,can you get pregnant at 400 pounds on - For Begninners

Chances are you have no idea you're pregnant yet—but your body is already hard at work. In the fourth week of your pregnancy, the ball of cells that is developing into your baby is the size of a poppy seed. It's at this stage that the cells separate into 3 distinct layers from which your baby's internal organs and skin will develop.
The creation of the brain, spinal cord, heart, and blood vessels is already well under way. The neural tube, which will form the brain and spinal cord starts to close from the center of the embryo outward. After it closes, the portion in the head thickens and divides into the forebrain, midbrain, and hindbrain. During this process, part of the yolk sac is incorporated into the lining of the digestive system.


Your baby's heart is transformed from a tube into an S-shaped loop that begins beading about 22 days after conception. At this point, you may begin experiencing early signs of pregnancy including nausea, fatigue, and breast tenderness. By your sixth week of pregnancy, your little one has tripled in size and is protected by amniotic fluid. You don't know if you're having a boy or a girl yet, but you can thank dad for your child's sex because one of two sex chromosomes either an X or a Y was delivered by the sperm determining your child's gender. The egg always contains an X so if the sperm contained an X, the embryo develops into a girl. A gene on the Y chromosome becomes active late in the sixth week, functioning for only a few days to tell the embryo to become a boy. The villi from the placenta intermingle with your blood where they steal some of your breakfast, lunch and dinner.


The nutrients and oxygen travel about 18 inches through the umbilical cord to your growing baby. It's too early to tell whether your child will have your nose, but mouth, nostril and ear indentations are visible in the head. What were once just little tissue buds have become recognizable as hands and feet with webbed fingers and toes. Soon, this extra tissue between the digits will be reabsorbed to reveal individual fingers and toes.



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