For those who have children or know the baby's gender... they say if the heart rate is under 140, it's a boy, and if it's over 140, it's a girl. Curious how often this is true.

Melanie • Rainbow baby girl conceived with the help of science and born 5/23/17, pregnant with baby number 2, due August 29th
Got an ultrasound this morning at 8weeks and 2 days. Heart rate was 186. My best friend and mom both immediately said it must be a girl. I am curious how often that is true.

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