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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 15 Week 15

Lanugo, your baby's first ultrafine, downy hair, now covers his back, shoulders, ears, and forehead. It helps him retain body heat, but once he gains enough fat to do the job, this hair will fall off -- probably before birth. Facial expressions are your baby's newest trick -- he can frown, squint, grimace and wince. Don't worry -- he's just flexing his facial muscles, not indicating his mood.