Fetal Development Weeks 36 Through 40

See what's happening with your baby in the ninth month of your pregnancy.

Week 36

For a child about to be born, baby fat is a very good thing. Your baby is working hard to accumulate all the fat he can at this point -- his body is growing rounder, and those adorable dimples are forming at elbows and knees. This build-up of fat -- about 15 percent of his total weight--will help him maintain his body temperature and give him a store of energy. Because the fat beneath his skin is white in color, it makes his skin appear lighter and less ruddy.

In a first-time mother, the baby often "drops" two to four weeks before delivery, as the baby's head descends into the mother's pelvic cavity. This is called "engagement," or "lightening," and it means it won't be long now before the big day!

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