Fetal heart rate is the rhythm of the heartbeat produced by the fetus under the regulation of the nervous system. Under normal circumstances, the fetal heart rate is not a fixed value, but generally varies around 110-164 beats per minute, so the fetal heart rate is subject to change. Fetal heart rate will be affected by external environmental changes, pregnant women’s mental state, pregnant women’s dietary habits, fetal activities and other factors, resulting in fetal hypoxia, causing fetal heart rate increase or slow down, if it is a temporary change in the fetal heart rate, is a normal phenomenon, if there is a long term change in the fetal heart rate, it will affect the normal development of the fetus. During pregnancy, pregnant women should maintain a smooth mood, pay attention to a balanced and nutritious diet, avoid overwork, pay more attention to rest, and do regular prenatal checkups to monitor the changes of fetal heart rate in time, so as to avoid affecting the normal development of the fetus.