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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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