Babies this week:
- Putting on layers of fat, your baby now weighs in around 1.5 to 2.5 pounds and measures about 13.6 to 14.8 inches.
- Baby's starting to develop more fat, so the once-wrinkly skin will start to get smoother.
- Baby's lungs are mature enough that if born now, he or she'd probably survive. Wow!
A look inside
(get a nice diagram of twins like this every 4 weeks from babycenter.com):