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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.
ultrasound week 31 Week 31 (29 weeks from conception)

Fetal Size: Length, 11 3/4 inches, crown to rump; total length almost 18 inches. Weight, 3 1/2 pounds.

Fetal Development Milestones: Baby continues to develop as he or she gains weight.

What You're Seeing: This image gives a close-up view of the lower end of your unborn baby's spine. You can see the spinal cord protected by the bright white bones of the spine.