Fetal heart monitoring is usually done in 20 minutes, the exact length of which depends on the specific condition of the pregnant woman. Fetal heart monitoring is a checkup for pregnant women after 28 weeks of pregnancy, applying the fetal heart rate electronic monitor to record the curve of the fetal heart rate, the normal fluctuation is 110~160 beats per minute, this checkup can check whether the fetus has hypoxia or not, most of the time it is done for 20 minutes, but there is very little or almost no movement of the fetus which may need to be prolonged, usually not more than 40 minutes. Fetal heart rate monitoring during labor sometimes requires continuous monitoring, depending on the mother’s condition. Before the fetal heart monitoring, pregnant women can do appropriate exercise, keep in a happy mood, avoid nervousness, can increase the success rate and accuracy of fetal heart monitoring, if necessary, consult a professional physician’s opinion.