Your baby now weighs approximately 4 1/2 pounds and is about 19 inches long from head to toes. Though his lungs won't be fully developed until just before birth, your little one is inhaling amniotic fluid to exercise his lungs and practice breathing. Some babies have a head of hair already, others have only a few wisps. Thick hair at birth doesn't necessarily mean thick hair later on, but children with fine hair in childhood usually have thinner hair in adulthood.
If your baby is a boy, his testicles should be descending from his abdomen into his scrotum. Sometimes, however, one or both testicles won't move into position until after birth. Luckily, for two-thirds of all baby boys who have undescended testicles, the condition corrects itself by a boy's first birthday.
You're gaining a pound a week, largely because your baby is likely to gain more than half his birthweight during the seven weeks before delivery.
¡@