If the pregnancy is normal and without any high-risk factors, fetal heart monitoring is recommended at 34 weeks, once a week. If the pregnancy is a high-risk pregnancy with pregnancy complications or comorbidities, it is recommended to perform fetal heart monitoring earlier and may need to be performed from 28 weeks. Fetal heart monitoring is to evaluate the fetal growth and development and whether the fetus is hypoxic in utero by continuously recording and observing the fetal heart rate and contraction changes. The practice of fetal heart monitoring is to monitor the fetal heart rate continuously for 20 minutes, and the fetal heart rate is considered normal if it is 110-160 beats/min. In addition, the fetal heart rate should have good variability, and the presence of effective fetal heart rate acceleration after fetal movement without repeated fetal heart rate deceleration indicates that the possibility of fetal hypoxia in utero is relatively small. It usually takes about 20 minutes to do a fetal heartbeat check, so avoid poor rest, improper diet and over fatigue before checking the fetal heartbeat. Before checking the fetal heartbeat, it is best for the pregnant woman to urinate and then lie flat on the bed to cooperate with the doctor. If the baby does not want to move, it may be sleeping, the pregnant woman can walk back and forth or play soft music to wake up the baby.