The fetal heartbeat can usually be monitored by ultrasound at 6-9 weeks of pregnancy, while the fetal heartbeat needs to be heard with a stethoscope at 18-20 weeks. If the fetal heart is heard with a fetal heart Doppler, it needs to be heard after 12 weeks of pregnancy, when the fetus passes from the pelvis into the abdominal cavity, and the fetal heartbeat can be clearly heard through the abdominal wall using a Doppler fetal heart auscultator. There is also variability, which may be related to the thickness of the abdominal fat of the pregnant woman. It is important not to perform strenuous exercise before the auscultation of the fetal heartbeat and to be in a relaxed state during the auscultation to avoid muscle tightness due to tension, which may lead to inaccurate or inaccessible auscultation. In addition, regular check-ups should be performed throughout the pregnancy, and abnormalities should be dealt with promptly. Generally, when the pregnant woman reaches 24 weeks of pregnancy, she should listen to the fetal heartbeat and count the fetal movement. From the 37th week of pregnancy, fetal heart monitoring needs to be done once a week, or from the 28th-30th week of pregnancy if there are comorbidities or complications. It is important to pay attention to whether the rhythm of fetal heart sound is fast and slow, etc. The normal fetal heart sound is 120-160 beats/min. If the fetal heart sound is above 160 beats/min or continuously below 120 beats/min, it all indicates intrauterine hypoxia of the fetus and should be treated promptly.