Wednesday, December 3, 2008

So what's happening in there?

The fertilized egg has made its seven- to ten-day trip to the uterus, where it implants cozily into the endometrial surface. It is now called a blastocyst and it has divided into two parts. While you are reading this, the first part is forming the placenta and the second part will become the embryo. The two layers that make up the amniotic bag of waters are newly formed, and the very beginning of the connecting stalk -- which will become the umbilical cord -- has appeared. Until your placenta is fully functioning, the yolk sac, now present, will feed your baby. Basically, the "home" for your little one is under rapid construction!

By the end of your fourth week your baby is an embryo. This group of embryonic cells is growing at a very rapid pace, each cell dividing daily. By the fourth week of pregnancy your developing baby is about 1mm in length and looks like a tiny tadpole, safely attached to your uterine wall and sending hormones to you body. The placenta is beginning to form and many wonderful and exciting changes are about to take place.
Despite its extremely tiny size — no longer than one millimeter and no bigger than a poppy seed — your little embryo is busy setting up house. The amniotic sac that boards your baby (also called the bag of waters) is forming, as is the yolk sac, which will later be incorporated into your baby's developing digestive tract.



The little "poppyseed"

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