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Science says that heart rate in early pregnancy is not be a reliable indicator of your babys sex. In fact, there seems to be little difference in the average beats per minute between males and. they concluded that a fetus heart rate was not an indication of its sex. In 2016, a study looked at 332 female and 323 male fetal heart rates recorded during the first trimester. Sure, thats all quite convincing data, but still i decided to conduct my own experiment to see if fetal heart rate could indicate a babys gender. To do my experiment, first i became pregnant with boygirl twins. This theory states that if the fetal heart rate is above 140 beats per minute (bpm), then the baby is more likely to be a girl. If the heart rate is below 140 bpm then the chances are that the baby will be a boy. The issue is, of course, what if the babys heart rate varies between 120-160 bpm? This is, after all, where the normal fetal heart. The baby is inside of a gestational sac, and the heart rate of the baby is used in the following ways if the heart rate is 140 bpm or higher, the baby is a girl. If the heart rate lower than 140 bpm, you are carrying a boy. heart rates start out slower, and then by 8-10 weeks run in the range of 170-200 bpm (beats per minute). As your approach mid-pregnancy, the average heart rates run between 120 - 160 bpm. If your baby moves, his or her heart rate goes up, just as your heart rate does with movement. Researchers arent sure why a boy fetus leads to greater pregnancy-associated metabolic changes than a girl fetus does, but these findings seem to be backed up by more than one study. There is one folktale, however, that scientists have studied and it has to do with whether fetal heart rate can predict gender. Another baby sex myth claims that if your babys heart rate is around 140 beats per minute, its a boy. The amniotic fluid can have higher concentrations of sex hormones dependent on the sex of the fetus, but this does not impact hormone levels in the mothers blood. A normal heart rate for an unborn baby is between 120 and 160 beats per minute, according to dr. According to myth, a woman is likely having a girl if her babys heart rate is 140 bpm or faster, and a heart rate lower than 140 bpm signals a boy.