Absolute myth... I have two boys and Brendan's heart rate was always around 165+ BPM and Tristan's was 130-140ish BPM.
Also did the ring test (solid gold ring on a piece of string) was wrong for Brendan but right for Tristan.
I had a bit of a lightbulb moment during my 12 week scan and said that surely the heartrate would go up and down depending on how active the baby had been/was when it was measured, just like ours does... and the dr doing the ultrasound looked at me as if to say, "Well, duh." and nodded.
I guess in the end it's always 50/50 either way, right? I really hope you get at least one boy
It was right for all three of mine - but off for this one. Heart rate is 142, and apparently a girl, whereas DS was exactly the same heart rate.... and the girls were higher...
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