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Second 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 2nd trimester of pregnancy gives you a look at each week of development.
Week 21 Week 21 (19 weeks from conception)

Fetal Size: Length, 7 1/4 inches, crown to rump; weight, 10 1/2 ounces.

Fetal Development Milestones: Baby is swallowing amniotic fluid. Bone marrow is beginning to produce red blood cells. Baby moves and wiggles frequently.

What You're Seeing: This profile image not only shows how your baby-to-be's bones and skeletal structures are forming, but also his lungs. Looking at his chest, the sonographer can identify the heart and lung tissue.