Fetal heartbeat 157 does not determine the probability of giving birth to a boy. In the medical field, fetal heartbeat is one of the important indicators. However, many people believe that the speed of the fetal heartbeat can predict the gender of the fetus. According to research, a fetal heartbeat of 157 does not determine the probability of giving birth to a boy. This article will elaborate on this from four aspects. Methods of Determining the Gender of the Fetus The most common method of determining the gender of the fetus is through ultrasound. Ultrasound detection can determine the gender of the fetus at around 20 weeks of pregnancy with an accuracy of more than 95%. In addition, there are amniocentesis and chorionic villus sampling