Sweet 16

Now boarding: Week 16.

Baby's getting ready for a growth spurt, because in the next few weeks she will double her weight and add inches to her length. Right now, she's about the size of an avocado (about 4 1/2 inches long and about 3 1/2 ounces). Her legs are much more developed, and her eyes have moved closer to the front of her head. Her ears are more erect than they have been, and her eyes have moved closer to the front of her head. The patterning of her scalp has begun, though her locks aren't recognizable yet. She's even started growing toenails.

There's a lot happening inside, too. For example, her heart is now pumping about 25 quarts of blood each day, and this amount will continue to increase as the baby continues to develop. She may also be practicing breathing by sucking in amniotic fluid and expelling it again, which also helps to develop her lungs. She's even peeing now -- up to twenty times a day!