A wonderful new sound enters the world this week: your baby's heartbeat. Although still too faint to be picked up by a doctor's stethoscope, it's visible in a sonogram as a tiny, pulsing dot in the middle of your still-transparent embryo's body. From now until birth, it will beat approximately 150 times a minute, twice the average adult heart rate. The rest of the embryo is working hard, too--it will triple in size this week, to about a quarter of an inch long.
from americanbaby.com
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