I dont really believe in that as all 3 of my sons had different heartbeats. My middle sons was high, but anyhoo with this pregnancy 8 weeks heartbeat was 179 and then 12 weeks 150 ultrasound other day 17 weeks 145.
My oldest son always in 130-150s range
Middle- 150-170s
Youngest- 140-160s range
My oldest son always in 130-150s range
Middle- 150-170s
Youngest- 140-160s range