By now, your baby weighs 3.75 pounds and is about 16.7 inches long, taking up a lot of space in your uterus. You're gaining about a pound a week and roughly half of that goes right to your baby. In fact, he'll gain a third to half of his birth weight during the next 7 weeks as he fattens up for survival outside the womb. He now has toenails, fingernails, and real hair (or at least respectable peach fuzz). His skin is becoming soft and smooth as he plumps up in preparation for birth.