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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 20 Week 20 (18 weeks from conception)

Fetal Size: Length, 5 2/3 to 6 1/2 inches, crown to rump; weight, 9 ounces.

Fetal Development Milestones: Hair and nails are continuing to grow. In girls, the uterus is now formed and the vaginal canal is also forming. You can feel fetal movements even more now!

What You're Seeing: Here, Baby-to-be is curled up with her leg tucked in and her arms covering her face, which is turned away. She may look scrawny now, but developmentally she's right on track. Her bones, visible in this 3-D image, are continuing to harden and develop.