In general, if the fetal stoppage is caused by its own reasons, it is usually considered to be a slow stop, if it is caused by external reasons, it is considered to be a sudden stop, so the specific situation still needs to be analyzed according to the specific circumstances. 1, their own reasons: 1, early pregnancy: because of the slow growth of HCG, progesterone, embryonic chromosomal abnormalities or its own stunted development and other reasons, there is only a long gestational sac, no fetal heart and fetal buds, this cause of fetal arrest is slow stop, often found in the ultrasound examination; 2, late pregnancy: if the fetus has placental abruption, umbilical cord around the neck and other conditions, will lead to intrauterine hypoxia, blood supply The fetus may move suddenly and frequently or without intermittent agitation before fetal arrest. External causes: If a pregnant woman suffers from trauma to the abdomen or strong contraction of the uterus or rupture of the uterus caused by other factors such as impact, fetal arrest will occur immediately, and the patient may show lower abdominal pain with vaginal bleeding, or in severe cases, strong abdominal pain, heavy vaginal bleeding with partial tissue flow out. In case of fetal abortion, patients are advised to go to the hospital as soon as possible, usually termination of pregnancy is the main treatment principle, if the fetus is in the uterine cavity for too long after abortion, there is a risk of uterine cavity infection, so timely medical abortion or uterine removal surgery is needed. In order to prevent the occurrence of fetal abortion, pregnant women need to pay attention to good living and eating habits, need to pay attention to safety, avoid falling, avoid hitting the abdomen, and perform maternity checkups on schedule in order to achieve early detection and early treatment.