Fetal heart rate is not related to the sex of the fetus. The normal fetal heart rate is 110-160 beats per minute. The normal fetal heart rate is 110-160 beats per minute. The fetal heart rate can be measured by tracing the instantaneous change of fetal heart rate to predict whether the fetus is hypoxic in the mother’s body. Therefore, there is no scientific basis for using the fetal heart rate to determine whether a boy or girl is born. Usually, the fetal heart rate varies with the week of pregnancy. If the fetal heart rate exceeds 160 beats per minute, it indicates that the fetal heart is too fast. If it is persistent, it may indicate that the fetus is suffering from hypoxia in the uterus and should be seen promptly. In addition, the physical condition of the pregnant woman also has an impact on the fetal heart rate. If a pregnant woman has fever and hyperthyroidism, the fetal heart rate will usually exceed 160 beats per minute. If the fetal heart rate is below 120 beats/minute, it indicates that the fetal heart is too slow. When the fetal heart rate is persistently slow, the fetus should be checked for the possibility of congenital heart disease. A slow fetal heart rate may also be related to intrauterine hypoxia. When the fetus is hypoxic, the heart rate usually speeds up first and then slows down, so if you find this situation, you should seek medical help in time. In addition, if a pregnant woman takes certain drugs, the drugs act on the fetus through the placenta, which can also cause the fetal heart rate to slow down, and this also requires attention.