I cant remember if it's 140 or 160 that is used. i.e. over 160 girl and below is boy.
I also recall reading its more in the later stages of preg rather than early. I never get told the heart beat, i am not sure if the doppler they use has it on a screen or not at my ob. I always mean to ask but forget when i hear that heartbeat sound cause it doesn't matter all of a sudden.
ive had a baby girl and her heart rate was always around 150 and now preg with bub number 2 and its a girl her heart rate is around 150ish aswel... so im not sure with boys
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