20 weeks--Half Way!

How your baby's growing: Your baby weighs about 10 1/2 ounces now. He's also around 6 1/2 inches long from head to bottom, and about 10 inches from head to heel — the length of a banana. (For the first 20 weeks, we use measurements taken from the top of the baby's head to her bottom — known as the "crown to rump" measurement. After that, we use measurements from head to toe. This is because a baby's legs are curled up against her torso during the first half of pregnancy and are very hard to measure.)

A greasy white substance called vernix caseosa coats his entire body to protect his skin during its long submersion in amniotic fluid. (This slick coating also eases the journey down the birth canal.)

Your baby is swallowing more, which is good practice for his digestive system. He's also producing meconium, a black, sticky substance that's the result of cell loss, digestive secretion, and swallowed amniotic fluid. This meconium will accumulate in his bowels, and you'll see it in h first messy diaper (although a few babies pass it in utero or during delivery).