Fetal heart monitoring is an important test to assess the development of the fetus in the uterus and is widely used in clinical practice. Whether the fetal heart monitoring is normal or not is based on the following aspects: i. The fluctuation range of fetal heartbeat. Normally, the fetal heart fluctuates between 120-160. If the fetal heartbeat is less than 120 beats per minute, then it is considered too slow. If the fetal heart rate is greater than 160 beats per minute, the fetal heart rate is considered too fast. It is important to note that whether the fetal heart rate is too slow or too fast. This is not the only way to determine abnormal fetal development. It should be combined with other indicators to determine. The variability of fetal heart rate. At present, the clinical use of Doppler fetal heart monitor to monitor the fetal heart. In this method, the fetal heart is different at each instant. This difference is both the variability of the fetal heart. If the variability of the fetal heart is poor, then the possibility of intrauterine distress needs to be alerted. Third, the fetal heart rate is accelerated. Under normal circumstances, the fetal heart will accelerate significantly when the fetus is moving. If there is no acceleration or deceleration of the fetal heart during fetal movement, it is more likely that the fetus is in intrauterine distress and needs attention. In summary, the fetal heart rate fluctuates between 120 and 160 beats per minute. The variability is good and the acceleration of fetal heartbeat is normal.