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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 23 Week 23 (21 weeks from conception)

Fetal Size: Length, 8 inches, crown to rump; weight, almost 1 pound.

Fetal Development Milestones: Baby-to-be is adding fat tissue and gaining weight. Rapid eye movements (REM) are now beginning.

What You're Seeing: With the baby-to-be crouched and his legs pulled in toward his chest, you can almost see his complete profile. Images of the baby's entire body are difficult now that he's more than 8 inches in length. He's about to experience a dramatic weight gain in the coming weeks. For now, he's still relatively thin.