Chances are you have no idea you're pregnant yet-but your body is already hard at work. Watch as the egg undergoes its wondrous transformation to embryo.
Fetal Development: Baby's Size
Medical Miracles in the Womb
The Inside Story: 40 Weeks of Fetal Development
Fetal Development Weeks 31 Through 35
Twins: A Closer Look at Your Developing Babies
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