Slide show: Fetal ultrasound
Fetal ultrasound showing the chambers of baby's heart
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This slide offers a four-chamber view of a baby's heart as well as the heart valves. This image is usually taken during a standard ultrasound, between weeks 18 and 20 of pregnancy. A baby's cardiovascular system begins developing five weeks into pregnancy, or three weeks after conception. The heart starts to beat shortly afterward.

Jan. 26, 2019