Into the second trimester, here is what is going on with our baby at 16 weeks courtesy of BabyCenter.com (note: any reference below to gender is pure speculation - we'll find out in September):
At 4 1/2 inches long (head to bottom) and 3 1/2 ounces, your baby is about
the size of an avocado. In the next three weeks, she'll go through a tremendous
growth spurt, though, doubling her weight and adding inches to her length. Her
lower limbs are much more developed now. Her head is more erect than it has
been, and her eyes have moved toward the front of her head. Your baby's ears are
close to their final position, too. Some of her more advanced body systems are
working, including her circulatory system and urinary tract. Her heart is now
pumping about 25 quarts of blood each day, circulating her total blood volume
through her body many times. (By the end of your pregnancy, this will increase
to about 190 quarts.) The patterning of her scalp has begun, though her hair
isn't recognizable yet. Although closed, her eyes are moving (slowly), and she's
even started growing toenails.
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