Pregnant fetus without fetal heart is related to many factors: First, fetal factors: fetus with chromosomal abnormalities or abnormal organ development can lead to the absence of fetal heart; there is a correlation with genetic factors, infection drugs and other factors can also lead to. Second, maternal factors: various factors can cause the pregnant woman’s internal environment to be in an abnormal state, affecting the development of the fetus, such as pregnant women suffering from serious systemic diseases, hypertension, chronic liver and kidney diseases, chronic wasting diseases, serious infections, severe anemia and heart failure, thrombotic diseases, etc.; maternal endocrine dysfunction, luteal insufficiency, polycystic ovary syndrome, hyperprolactinemia, thyroid function abnormalities, severe uncontrolled diabetes mellitus. Paternal factors: chromosomal abnormalities can cause the embryo to fail to develop normally, such as abnormal sperm, excessive smoking, alcoholism, etc. Environmental factors: Environmental factors can cause the embryo to stop developing and the fetus has no fetal heart. Excessive exposure to chemical substances, arsenic, lead, formaldehyde, etc., exposure to radiation, high temperature, high noise environment, etc. All of the above may lead to the existence of the fetus without fetal heart after pregnancy.