Fetal heart monitor is an instrument used to monitor the fetal heart beat, if the pregnant woman belongs to the advanced age or high-risk maternal and so on, it is necessary to buy, if the fetus is relatively healthy, then you can not buy. Fetal heart monitor through the monitoring of fetal heart beat, can detect the existence of fetal intrauterine hypoxia and other abnormalities, the general normal fetal heart rate is 110 ~ 160 times / min, in line with the fluctuations of this range, the fetus is normal, if the fetal heart beat too fast or too slow, suggests that there may be intrauterine hypoxia and other abnormalities of the fetus. Therefore, if the pregnant woman is low-risk without any comorbidities, and the fetus is developing normally, you can consider not using the fetal heart monitor for the time being. If the pregnant woman is of high age or has comorbidities and other high-risk factors, it is recommended to purchase a fetal heart monitor. It is convenient to monitor the intrauterine condition of the fetus at any time. If the fetal heart beat range continues to exceed the normal range, please consult a doctor in time, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and symptomatic treatment.