The main symptoms of 9-week fetal arrest are cessation of uterine enlargement, disappearance of early pregnancy reaction, and inability to see the fetal heart on ultrasound. After 9 weeks of gestation, the uterus stops enlarging and does not match the size of 9 weeks of gestation. At 9 weeks of gestation, the uterus is not yet out of the pelvis, this manifestation is not obvious, and only the cessation of uterine enlargement can be observed. In some patients, early pregnancy reactions such as drowsiness, fatigue, and lack of appetite may disappear, and the fetal heartbeat may not be visible on imaging such as ultrasonography. If the dead fetus stays in the mother’s body for too long, it can cause coagulation dysfunction of the mother’s body, resulting in disseminated intravascular coagulation, etc., and the discovery of fetal arrest should be promptly consulted for diagnosis and treatment.