It's just that an old wives tale…I'm having a girl and when she is active her HB is 139 at the most….
My little boys heart beat was in the 160's when i wasnt as far along and lately its around 140 at my appointments
My little ones hb is a constabt 142 & we're havibg a girl
My baby's heartbeat has been anywhere from 130s-160s & I'm having a boy !
In my case it WAS off....before yesterday they had measured the HB twice....167 &173 ....but its a boy and yesterday at my anatomy scan the HB was 155
From what I have read on it, it's anything above 140 is a girl and anything below 140 is a boy.
However this question has been posted on here before and the myth is way off in most cases