Saturday will be 16 weeks

Saturday will be 16 weeks.

At 4 1/2 inches long (head to bottom) and 3 1/2 ounces, baby is about the size of an avocado. In the next three weeks, she/he'll go through a tremendous growth spurt, though, doubling her/his weight and adding inches to her length. Her/his lower limbs are much more developed now. Her/his head is more erect than it has been, and her/his eyes have moved toward the front of her/his head. Our baby's ears are close to their final position, too. Some of her/his more advanced body systems are working, including her/his circulatory system and urinary tract. Her/his heart is now pumping about 25 quarts of blood each day, circulating her/his total blood volume through her/his body many times. (By the end of your pregnancy, this will increase to about 190 quarts.) The patterning of her/his scalp has begun, though her/his hair isn't recognizable yet. Although closed, her/his eyes are moving (slowly), and she/he's even started growing toenails.