Monday, January 1, 2007

Week 4!

This week marks the beginning of the embryonic period. From now until ten weeks, all of our baby's organs will begin to develop and function. As a result, this is the time when she'll be the most vulnerable to anything that might interfere with her development.

Right now your baby is an embryo consisting of two layers: the epiblast and the hypoblast, from which all her organs and body parts will develop. The primitive placenta is also made up of two layers at this point. Its cells are tunneling into the lining of my uterus, creating spaces for your blood to flow into so that the developed placenta can provide nutrients and oxygen to your growing baby when it starts to function at the end of this week. Also present now are the amniotic sac that will house our baby, the amniotic fluid that will cushion her as she grows, and the yolk sac that produces our baby's red blood cells and helps deliver nutrients to her until the placenta is ready to take over this duty.

No comments: