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)
FHC; Science Photo Library
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.
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