The fetal heart is the beating of the baby’s heart. It is normal for a woman’s fetal heart to beat between 110-160 beats per minute during pregnancy. If the fetal heart rate is lower than 110 beats per minute or higher than 160 beats per minute, most of the time there will be fetal distress or asphyxia, which needs to be treated promptly, including lying on the left side, oxygen or medication. Fetal distress or asphyxia, generally more common in late pregnancy, need to do ultrasound and fetal heart monitoring, and also pay attention to observe whether the fetus has the umbilical cord around the neck, aging placenta, amniotic fluid contaminated by the factors caused by fetal heart changes and the occurrence of pregnancy complications, the persistence of a longer period of time to appear in the fetal distress, asphyxia, the serious case is to lead to stillbirth, stillbirth, and so on, should be regular during the period of delivery. Therefore, regular checkups should be conducted during pregnancy, and fetal heart monitors can be used to monitor the fetal heart.