The absence of fetal heartbeat during pregnancy may be caused by the fetus’ own chromosomal abnormalities, viral infections of the pregnant woman, and bad lifestyle habits. It is important to follow the doctor’s instructions strictly during pregnancy and go for regular checkups. Chromosomal abnormality of the fetus itself is a common and important reason for the absence of fetal heart. Some bacteria and viruses enter the blood circulation of the fetus through the placenta, which may lead to fetal arrest and miscarriage. In addition, if pregnant women have some bad habits, exposure to too many chemicals, etc., it may lead to chromosomal abnormalities during the development of the fetus, which may cause the embryo to stop developing and have no fetal heart. Therefore, if there is no fetal heartbeat during pregnancy, it is recommended to consult a doctor in time in order to identify the specific cause of the problem.