The fetal heart cannot usually be heard with the ear on the belly because the fetal heartbeat is the heartbeat of the fetus, which is located in the uterine cavity and protected by the uterine and abdominal walls. Under normal circumstances, it needs to be heard by auscultation with instruments such as Doppler fetal heart rate stethoscope, ultrasound and stethoscope to understand the state of the fetus in the womb. The fetal heartbeat is similar to the ticking sound of a clock, which changes from time to time with the changing environment in the uterus. The normal fetal heart rate is 110-160 beats/min. If the fetal heart rate is >160 beats/min and lasts for more than 10 minutes, the fetal heart is tachycardic; if the fetal heart rate is <110 beats/min and lasts for more than 10 minutes, the fetal heart is bradycardic. If the fetus has abnormal fetal heart rate, it means the fetus is lack of oxygen in the uterus and needs to seek medical treatment in time. It is recommended that pregnant women have regular maternity checkups and pay attention to fetal heart monitoring after 34 weeks of pregnancy to ensure the normal development of the fetus. If the fetus moves more than 3 times an hour, it is generally considered normal.
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