The embryo stops developing in the eighth week of pregnancy, often due to the following reasons: 1. the most common reason, the embryo genetic deficiency. 2. the embryo stops developing clinically because the mother is suffering from some kind of disease, such as abnormal liver function, abnormal kidney function, or due to coagulation dysfunction. 3. environmental pollution, such as living in an environment with a large number of harmful and toxic gases, inhaled by the pregnant woman can cause the embryo to stop developing. 4. sudden noise may also lead to embryonic arrest. Therefore, it is recommended to have a health checkup before the next pregnancy and to leave the polluted environment. This will lead to a smooth pregnancy and a successful pregnancy.