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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 15 Week 15 (13 weeks from conception)

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

Fetal Development Milestones: Baby's skeletal system is continuing to develop. Characteristic hair patterns on the scalp are taking shape.

What You're Seeing: In this 3-D image, the baby-to-be is curled up, her hands covering her face (she's about the size of a grapefruit). The large bones that make up her skull are forming and hardening. As they harden, the bones appear whiter and brighter in the image. These cranium pieces do not come together until well after birth.