See how your baby grows Our fetal development diagrams show how your baby is changing as he grows. Click on the thumbnail illustrations below for a better view. Or for more detailed information, choose the fetal development article for your week from the pulldown below. The heart, which is no larger than a poppy seed , has begun beating. The embryo is about 1 inch long and has distinct, slightly webbed fingers.
Veins are clearly visible.
The heart has divided into right and left chambers. He has begun swallowing and kicking. All organs and muscles have formed and are beginning to function. More Information on Fetal Development Your baby is covered with a layer of thick, downy hair called lanugo . His heartbeat can be heard clearly.