According to www.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."
According to my iPregnancy iPhone app:
"Your baby boy continues to gain weight as increasing amounts of fat are deposited in the skin. This will cause his skin to become increasingly opaque in color. The hair on his head is more prominent, and the eyebrows and eyelashes have fully developed. Lanugo continues its slow disappearance. The survival rate for babies born at 31 weeks is about 96%; of surviving infants, the rate of serious medical complications is about 20%. Remember that survival and complications rates are highly dependent on the baby's sex and race as well as the quality of the NICU. The baby's eyesight is improving, and the iris can dilate and constrict in response to light and dark; however, his vision remains far from 20/20. The iris is starting to become pigmented. Most light-skinned babies are born with blue eyes, whereas dark-skinned babies are usually born with brown eyes. The final eye color may take up to six months to be defined."
(photo courtesy of www.babycenter.com)
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