The normal range of fetal heart rate for babies during pregnancy is 110-160 beats/min. Each prenatal visit is required to measure the fundal height and listen to the fetal heart rate, the normal range of the baseline fetal heart rate is 110-160 beats/min, the baseline fetal heart rate >160 beats/min is called fetal tachycardia, and the baseline fetal heart rate <110 beats/min is called fetal bradycardia. The baseline fetal heart rate is one of the indicators of the prenatal monitoring no stress test (NST), which is used to predict intrauterine reserve capacity. Normal NST is 110-160 beats/min at baseline fetal heart rate; atypical NST is 100-110 beats/min at baseline fetal heart rate or >160 beats/min and <30min; abnormal NST is <100 beats/min at baseline fetal heart rate or >160 beats/min and >30min. The interpretation of NST results should be under the guidance of professional physicians, combined with the baseline fetal heart rate variability and gestational weeks to make a comprehensive judgment, the general normal, atypical NST need to be followed up or further evaluated, and the abnormal NST need to be reviewed in a timely manner, a comprehensive assessment of the fetal status, and timely termination of pregnancy, if necessary.