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

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

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FHC; Science Photo Library

a 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.