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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 14 Week 14 (12 weeks from conception)

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

Fetal Development Milestones: Male or female genitalia are now formed. Baby's liver and spleen are producing red blood cells. Also, his or her upper limbs are proportionate to the rest of the body. The lower limbs are slightly shorter.

What You're Seeing: The sonographer has magnified the image to show the baby-to-be's profile. His head is on the right-hand side of the image and his hand is on his chest.