I went to the dr yesterday.
BF3 (Baby Furry 3) has a heart rate of 152 at the highest.
What I found on internet:
To conduct the this old wives take you simply take your baby's heartrate in beats per minute (bpm) using a doppler or fetoscope and look at the chart:
Over 140 = girl
Under 140 = boy
As you know, we are NOT finding out. So wive's tales will have to do for us!