Fetal heart is at 110-160 beats per minute when the baby is asleep, and the baby’s fetal heart does not show a fixed number of beats in a certain period of time. Fetal heart, i.e. the heartbeat of the fetus, can reflect the state of the fetus in the mother’s womb. When the fetus is deprived of oxygen for various reasons, the fetal heart is sensitive to changes. The normal fetal heart rate is 110-160 beats per minute, and the normal fetal heart rate varies with the environment of the uterus. The change of fetal heart rate is the performance of the normal regulation of the central nervous system, and it is also a sign that the fetus is in good condition in the uterus. Although pregnant women cannot hear the fetal heartbeat themselves, they can buy a professional fetal heart stethoscope and learn and master the methods of listening to the fetal heart and counting the fetal heart rate under the guidance of obstetricians. When listening to the fetal heart, adopt an optimal position to assist in listening to the fetal heart sound, and at the same time make a record. Fetal heart is 110-160 beats per minute after the baby falls asleep. If the fetal heart is not within the normal range when listening to the fetal heart, the pregnant woman should go to the hospital in time to avoid some uncertainties delaying certain effects on the fetus.