The main causes of stillbirth in early pregnancy are the following: 1, genetic chromosomal abnormalities, because abnormal eggs and sperm carry abnormal chromosomes, which can make the fertilized egg or even the embryo develop abnormally and cause death; 2, smoking and alcoholism: male smoking and alcoholism can have an impact on the quality of sperm, which can also cause stillbirth. Women’s smoking and alcohol abuse can also cause fetal malformations and in serious cases, stillbirth; 3, viral infections: for example, pregnant women are infected with rubella, cytomegalovirus, herpes, measles virus, and hepatitis B virus in the early stages of pregnancy, and these viruses also have some fatal effects on the fetus; 4, taking drugs that affect the development of the embryo during pregnancy: for example, pregnant women unknowingly take some drugs that are prohibited during pregnancy The embryo may be affected by the development and health of the embryo, resulting in death; 5, insufficient blood supply to the placenta: now more common easy embolism, is the placenta’s blood circulation caused by fetal hypoxia death, which occurs more often in the middle and late pregnancy; 6, systemic diseases of pregnant women: such as diabetes, hypertension, heart disease, viral infections and severe anemia, high fever, and long-term medication can cause fetal death; 7, ionizing radiation or radioactive material radiation, can also lead to the death of the embryo.