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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 29 Week 29 (27 weeks from conception)

Fetal Size: Length, 10 1/2 inches, crown to rump; total length 16 3/4 inches. Weight, 2 3/4 pounds.

Fetal Development Milestones: Your little one's muscles are maturing. She'll continue to gain weight over the coming weeks.

What You're Seeing: This week, your baby-to-be's bones are hardening, and her muscles strengthening. In fact, you may have noticed from her kicks and jabs that she's growing stronger each week. Bones appear bright white on a sonogram. Although you can't see it in this image, your baby has probably been practicing his breathing movements this week, though his lungs still need more time to mature.