Clinically, the termination of pregnancy less than 28 weeks, fetal weight less than 1,000g is called miscarriage, and divided into early and late miscarriage with 12 weeks as the boundary. Fetal arrest in the early stages of pregnancy, the medical terminology is auditory abortion, is a special case of early miscarriage. Retained miscarriage refers to the death of the embryo or fetus in the uterine cavity in time to expel naturally. There may be the following symptoms: nausea and vomiting and other early pregnancy reactions suddenly disappear, the appearance of vaginal bleeding, paroxysmal lower abdominal pain and other aura of miscarriage, gynecological examination of the cervix is not open, the uterus is smaller than the number of weeks after menopause, the texture of the uterus is not soft, and fetal heartbeat is not detected, and so on. It is worth noting that some patients do not have any symptoms after fetal arrest in early pregnancy. Clinical diagnosis is more often assisted by vaginal ultrasound, such as after 6 weeks of menopausal cycle but still can not see the fetal sac, or fetal sac deformation wrinkles; fetal sac reaches 4cm but still can not see the fetal buds, or fetal heartbeat can not be detected after the fetal buds reach 1.5cm; the above descriptions can be regarded as abnormal embryonic development, commonly known as embryonic stagnation, i.e., abortion with abortion. When there is an induced abortion, we need to make an appointment with the hospital outpatient clinic as soon as possible to remove the necrotic pregnancy tissues that remain in the uterine cavity in a timely manner. Because with the prolongation of time, the risk of intrauterine infection (often a mixture of anaerobic and aerobic bacteria) increases significantly, and even spread to the pelvic and abdominal cavities, resulting in pelvic inflammatory disease (the probability of ectopic pregnancy increases in the next pregnancy), peritonitis; if absorbed into the bloodstream, it can be complicated by sepsis, infectious shock, and other diseases, which is a life-threatening condition.