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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 19 Week 19

Vernix caseosa begins to coat the skin. The greasy, cheese-like white coating helps regulate body temperature and protects your baby's skin while it's submerged in amniotic fluid. By the time your baby is born, most of the vernix will be gone. Your baby's heartbeat is growing stronger now and it's about twice as fast as yours.