Fetal heart is usually present as early as about 6 weeks after menopause, but there are individual variations. In early pregnancy, as the embryo develops, the earliest time that the embryo can be seen on ultrasound is around 6 weeks of menopause, when the embryo buds and the primitive heart tube beat can be seen. At about 12 weeks of gestation, the fetal heart can be heard through the abdominal wall with a Doppler fetal heart stethoscope, and the fetal heart sounds like a clock ticking, and the speed is relatively fast, with a normal rate of 110-160 beats per minute/minute. When the fetal heart rate is <110 beats/minute or >160 beats/minute, it is necessary to follow the doctor’s instructions to carry out fetal biophysical scoring and umbilical cord blood flow and other examinations, combined with the changes in fetal movement to comprehensively assess the intrauterine status of the fetus, and terminate the pregnancy at the right time to ensure the safety of mothers and infants.