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Third Trimester: Images of Your Developing Baby

We've partnered with the American Institute of Ultrasound Medicine (AIUM), Johns Hopkins, and the March of Dimes to create this unique peak into Baby's development inside the womb. These images reveal all the intricate details of your baby's growth -- from a collection of cells to a full-term newborn. While most women may only receive one or two ultrasounds during pregnancy, which is normal, this slideshow of the 3rd trimester of pregnancy gives you a look at each week of development.
Week 32 Week 32 (30 weeks from conception)

Fetal Size: Length, 11 1/2 inches, crown to rump; total length 19 inches. Weight, 4 pounds.

Fetal Development Milestones: Baby's toenails are now formed, he's practicing his breathing, and he's continuing to gain weight and grow.

What You're Seeing: There's not much to report on your baby-to-be's developmental milestones this week. Much of his growth is strictly adding weight through fat layers that will insulate his maturing organs. He'll need plenty of fat tissue to keep him warm once he leaves his home in your womb and enters the world, where the environmental temperature is not as controlled. Although you can't see it in this image, your baby has probably been attempting to breathe this week, though his lungs still need more time to mature. Another development you'll notice in this image -- look closely and you might spy the edges of his toenails, which are now fully formed.