For example, the number of beats can differ from one prenatal visit to the next, according to KidsHealth. By this point, only women still met their study criteria. And interestingly, this is what happened when they were looking for a correlation between foetal heart rate and gender. Here is how it works: As a result, it can reveal the sex of your baby. Keep guessing along with your friends and family. It is thought that when you are carrying a girl, you have extra estrogen on board. The main goal of these tests is not to determine the sex of your child. An amniocentesis, though usually performed to check for abnormalities, can also be used to extract DNA, which can be used to discover the gender. They continue to increase until they peak around week 9 , between and bpm for boys and girls alike. These tests look for genetic abnormalities just like the cell-free DNA. This legend goes way back to around years ago, and uses a lunar moon cycle , the date of conception, and moms date of birth. Of these pregnancies, were revealed to be girls, while were revealed to be boys. You're asked to show your hands and you present them palms up. Some say they have experienced the opposite, where boys took the glow from their skin, and girls made them radiant. Because the content you submit in the interactive parts of our site will be available to all our users and may be available to the general public, please do not provide personal or confidential information. Female fetal heart rates have been shown in studies to run higher during labor, but this is the only time that researchers have actually seen it happen.