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First 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 1st trimester of pregnancy gives you a look at each week of development.
Week 6 Week 6: Tracking Baby's Heartbeat (4 weeks from conception)

Fetal Size: 1/6 to 1/4 of an inch.

Fetal Development Milestones: There's a measureable heartbeat.

What You're Seeing: Here, the sonographer demonstrates the developing baby's heartbeat. The top part of the image shows placement of a measuring tool on the ultrasound machine called an M-mode through the image of the beating heart. This tool shows movement over time, which is displayed on the bottom part of the image. The image on the bottom shows how the baby's heart rate is calculated.

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