Sonogram Pictures Week-by-Week, Photos of Baby's Development

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Sonogram Pictures Week-by-Week: Your Guide to What's Going On in There!

Week by week sonogram photos of your baby's development. See what's going on in there while you're pregnant each week. (37 Photos)

-iVillage on May 5, 2010 at 10:34PM

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FHC; Science Photo Library

a -iVillage on May 5, 2010 at 10:39PM

Congratulations; you’re expecting! The earliest sign that you’ve got a baby on board is the gestational sac in this picture. Inside the sac, your baby is made up of two microscopic layers of cells from which all his organs and body parts will develop.

See what else is happening at 5 Weeks Pregnant.