17 Weeks

How your baby's growing:
Your baby's skeleton is changing from soft cartilage to bone, and the umbilical cord — his lifeline to the placenta — is growing stronger and thicker. Your baby weighs 5 ounces now (about as much as a turnip), and he's around 5 inches long from head to bottom. He can move her joints, and his sweat glands are starting to develop.