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When does the heart start beating in a fetus?

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22 Days.


23 days after conception according to my Anatomy and Physiology Honors professor who is also an Ob/Gyn, in a closed circulatory system. However, you will not be able to hear the fetus' heartbeat until approximately 6 weeks, the latter part of the first trimester.

Clarification by medical student: Technically the weeks of pregnancy begin the first day of the last period, though conception doesn't occur until 14 days after that typically (so you aren't actually pregnant the first two weeks of your pregnancy). 23+14=37. So when you are between 5 and 6 weeks, approximately 23-30 days after conception, you will be able to hear the heartbeat)
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