In early pregnancy, the embryo stops developing, and for some women, the early pregnancy reaction suddenly decreases very obviously, or even disappears. After a period of time, a small amount of vaginal bleeding and abdominal pain may occur. In many women, after the embryo has stopped developing for a period of time, spontaneous miscarriage may occur. In the middle and late stages of pregnancy, if the fetus dies in the uterus, the most important manifestation is that the woman cannot feel the fetal movement by herself, and the fetal movement disappears. If the fetal heart is not heard in the hospital, it is highly suspected that the fetus is still in the womb. Once the fetal death occurs in the uterus, it should be treated immediately, because if the fetal death in the uterus is not treated, it will cause infection to the uterine cavity over time, and the infection may affect the woman’s blood clotting dysfunction. Once the coagulation dysfunction occurs, the possibility of postpartum hemorrhage may occur in the future treatment.