Baby's Development -
Four weeks into pregnancy, baby (called an embryo) consists of two layers of cells, the epiblast and the hypoblast — that will eventually develop into all of baby's organs and body parts. Two other structures that develop at this time are the amnion and the yolk sac. The amnion, filled with amniotic fluid, will surround and protect the growing embryo. The yolk sac will produce blood and help to nourish the embryo until the placenta takes over that role.
Woman's Body -
This week baby continues to implant in uterus, burying itself deep within the endometrium. Once implanted, baby starts to produce a hormone called human chorionic gonadotropin (HCG), which helps to maintain the lining of the uterus. It also sends a signal to the ovary to stop releasing an egg each month, which stops monthly periods of pregnant lady.
Four weeks into pregnancy, baby (called an embryo) consists of two layers of cells, the epiblast and the hypoblast — that will eventually develop into all of baby's organs and body parts. Two other structures that develop at this time are the amnion and the yolk sac. The amnion, filled with amniotic fluid, will surround and protect the growing embryo. The yolk sac will produce blood and help to nourish the embryo until the placenta takes over that role.
Woman's Body -
This week baby continues to implant in uterus, burying itself deep within the endometrium. Once implanted, baby starts to produce a hormone called human chorionic gonadotropin (HCG), which helps to maintain the lining of the uterus. It also sends a signal to the ovary to stop releasing an egg each month, which stops monthly periods of pregnant lady.
