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First Trimester: Images of Your Developing Baby

Do you know what to expect in the first trimester of pregnancy? 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 during the first trimester. These images reveal all the intricate details of your baby's growth. While most women normally receive one or two ultrasounds during pregnancy, this slideshow of the first trimester of pregnancy gives you a look at each week of development.
Week 10 Week 10 of Pregnancy

Fetal Size: Length, 1.22 inches; weight, 0.14 ounces.

Fetal Development Milestones: Eyelids are developing, and Baby's ears are fully formed (but not yet in position). The neck is forming. Fingers and toes are becoming more defined.

What you're seeing: You'll notice in this image that your baby-to-be is looking more and more like a newborn. Her arms and legs are visible, and a recognizable profile can be seen. The bright white areas in the profile are facial bones.