From What to Expect:
With just three more weeks to go and at about six and a half pounds (though weight and height vary from fetus to fetus), your baby is doing just fine. You can expect weight gain to be about half an ounce per day. (Boys, though, are likely to be heavier at birth than girls. And here's a bit of boy baby trivia to back that one up: Moms carrying boys tend to eat more than moms carrying girls — a foreshadowing of teenage refrigerator raids to come.) Since your little one is considered full-term at 37 weeks pregnant, if your baby was to leave the wet nest this week, he or she would likely thrive. That's because Mother Nature and you have done such a fine job.
So what's keeping your little one busy while waiting it out until D-day? Practice, practice, practice. Your baby is simulating breathing by inhaling and exhaling amniotic fluid, sucking on his or her thumb, blinking, and pivoting from side to side (one day you feel the tushy on the left side, another day it has swung around to the right side). All these are skills needed for his or her next gig — starring as newborn.
Here's an interesting fact: Your baby's head (which, by the way, is still growing) will, at birth, be the same size circumference as his or her hips, abdomen, and shoulders. And guess what's making an impression (literally) these days on those shoulders and hips: fat — causing little dimples in those cute elbows and knees, shoulders and hip, and creases and folds in the neck and wrists.
From Baby Center:
Your baby weighs 6 1/3 pounds and measures a bit over 19 inches, head to heel (like a stalk of Swiss chard). Many babies have a full head of hair at birth, with locks from 1/2 inch to 1 1/2 inches long. But don't be surprised if your baby's hair isn't the same color as yours. Dark-haired couples are sometimes thrown for a loop when their children come out as blonds or redheads, and fair-haired couples have been surprised by Elvis look-alikes. And then, of course, some babies sport only peach fuzz.