The heart tube beat is a manifestation of the fetal heart in early pregnancy, but it is still an embryo and cannot be called a fetus, so the heart tube beat seen at this time cannot be considered a fetal heart. When the embryo is 7-8 weeks old, the primitive heart tube beat and yolk sac can be seen, indicating that the fetus is growing and developing normally, but the beat is not stable at this time, and the accurate fetal heart rate may not be obtained under Doppler ultrasound. After the heart tube pulsation is found in the early pregnancy examination, it proves that the fetal heart structure and function are being gradually improved. If the pregnant woman is malnourished, inhales toxic gas, is exposed to certain drugs, smokes and drinks alcohol, it is likely to cause the fetal development to be delayed, stop developing, or even develop malformation. In early pregnancy, pregnant women need to strictly control their nutritional intake and pay attention to environmental safety to avoid adverse effects on fetal growth and development. The normal fetal heart rate is 120-160 beats per minute, regular and strong. When the fetal heart rate is abnormally fast or slow, it often indicates intrauterine hypoxia, and pregnant women need to go to the hospital for treatment in time.