The normal range of the fetal heart rate is 110-160 beats per minute. The fetal heart can usually be seen at 6 weeks of pregnancy, when the fetal heart can only be detected by ultrasound. After 12 weeks of pregnancy, when the uterus enlarges and bulges out of the pelvic cavity, the fetal heart can be heard on the abdomen with a fetal heart monitor. In early pregnancy, the fetal heart rate may increase and may reach 170 beats per minute, which is normal. Usually, after 14 weeks of pregnancy, the fetal heartbeat is more stable, usually stabilizing at 110-160 beats/min. If there is no abnormality in the prenatal checkup, fetal heart monitoring is usually performed starting at 36 weeks of pregnancy. The comprehensive assessment of fetal heart monitoring can reflect the baby’s condition in the womb well, and can see whether the fetus is hypoxic and responds well, which are to be done routinely. Generally, fetal heart monitoring can be performed once a week, and if there is any abnormality, the frequency of fetal heart monitoring should be increased.