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
My baby's heart rate was 140 at my scan, and we also found out she is a litle girl at the same scan.
As for the chinese gender calender, apparently it is more accurate if you use your age of conception in chinese lunar years. Mine has been right for all mine using chinese years.
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