The baseline of the fetal heart rate in 16 weeks of pregnancy is about 160

beats per minute(bpm), and 140 bpm on average during post-pregnancy(it’s

drop 1 bpm each week after 16 weeks of pregnancy)

An unborn baby’s heart arte normally ranges from 120–160 bpm..

Slight overspeed: 161–180 bpm

Heavy overspeed: _181 bpm

Slight slowness: 119–100 bpm

Heavy slowness: _99 bpm