Fetal Heart Rates
Starting at week 5 the fetal heart rate accelerates by 3.3 bpm per day for the next month.
The fetal heart begins to beat at approximately the same rate as the mother's, which is typically 80 to 85 bpm. The approximate fetal heart rate for weeks 5 to 9 (assuming a starting rate of 80):
- Week 5 starts at 80 and ends at 103 bpm
- Week 6 starts at 103 and ends at 126 bpm
- Week 7 starts at 126 and ends at 149 bpm
- Week 8 starts at 149 and ends at 172 bpm
- At week 9 the fetal heartbeat tends to beat within a range of 155 to 195 bpm.
At this point, the fetal heart rate begins to decrease, and generally falls within the range of 120 to 160 bpm by week 12.
Read more about this topic: Doppler Fetal Monitor
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