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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.
ultrasound week 17 Week 17 (15 weeks from conception)

Fetal Size: Length, 4 1/2 to 4 3/4 inches, crown to rump; weight, 3 1/2 ounces.

Fetal Development Milestones: Fetal bones are becoming more visible on ultrasound. You may be able to feel some fetal movement, particularly if you have been pregnant before.

What You're Seeing: This close-up shows the baby-to-be's tiny right hand. You can see each bone within her delicate fingers. Although she may not be coordinated enough now to use her fingers (other than to wiggle!), by the time she's born she will have matured to the point where her fingers will have some dexterity -- she'll even be able to grasp your finger with her hand!