31 Weeks

From Babycenter.com:
"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."

From Pregnancyweekly.com:
"Your baby now weighs approximately 3.5 pounds, measures about 18 inches from head to toe, and is getting used to the world of light and dark by opening and closing its eyes. Its facial muscles continue to strengthen, and your baby can make different expressions."