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Your Developing Baby, Week by Week

Your baby begins as a tiny cluster of cells, but during the nine-month process of pregnancy she becomes an amazing baby with facial features, a beating heart and kicking legs. Find out what's happening with baby's development week by week.
week 21 Week 21

Part of your baby's growth spurt at this point is likely because his stomach is now equipped to start absorbing energy-boosting nutrients from the amniotic fluid he's swallowing in there. Most of your baby's nourishment is still coming directly from the placenta, though.