How your baby's growing:
Get ready for a growth spurt. In the next few weeks, your baby will double his weight and add inches to his length. Right now, she's about the size of an avacado: 4 1/2 inches long (head to rump) and 3 1/2 ounces. Her legs are much more developed, her head is more erect than it has been, and her eyes have moved closer to the front of his head. Her ears are close to their final position, too. The patterning of her scalp has begun, though her locks aren't recognizable yet. She's even started growing toenails. And there's a lot happening inside as well. For example, her heart is now pumping about 25 quarts of blood each day, and this amount will continue to increase as your baby continues to develop.