Fetal Development By Week: 4 Weeks Pregnant

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iVillage Staff on Mar 18, 2010 at 4:46PM

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Fetal Development By Week: 4 Weeks Pregnant

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Fetal Development Week 4: See Your Baby Grow

The placenta begins forming during week four, although it won’t be on duty for several more weeks. This illustration shows the yolk sac, which acts as a stand-in for the placenta, along with the developing umbilical cord (it's that twisty thing extending from fetus' tummy).

Get more information on being 4 weeks pregnant.

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