How your baby's growing: This week, your baby measures over 16 inches long. He weighs about 3.3 pounds (try carrying four navel oranges) and is heading into a growth spurt. He can turn his head from side to side, and his arms, legs, and body are beginning to plump out as needed fat accumulates underneath his skin. He's probably moving a lot, too, so you may have trouble sleeping because your baby's kicks and somersaults keep you up. Take comfort: All this moving is a sign that your baby is active and healthy.
Every week has new significance now that our baby might come early. Fortunately, he's probably a little bigger than the average for 31 weeks based on the ultrasound they did last week. So if he does end up coming early, hopefully he won't be too, too small. He's certainly having fun in there moving lots.