How You're Growing: 40 Weeks

"It's hard to say for sure how big your baby will be, but the average newborn weighs about 7 1/2 pounds (a small pumpkin) and is about 20 inches long.  Her skull bones are not yet fused, which allows them to overlap a bit if it's a snug fit through the birth canal during labor.  This so-called 'molding' is the reason your baby's noggin may look a little conehead-ish after birth.  Rest assured--it's normal and temporary."  [source]