Fetal movement disappears, abdominal pain, vaginal bleeding, and the uterus stops enlarging in the sixth month of pregnancy. 1. Fetal movement disappears. Six months of pregnancy belongs to the middle of pregnancy, under normal circumstances can feel the fetal movement. If fetal arrest occurs, fetal movement will disappear and the fetal heartbeat will not be heard. 2. Abdominal pain. Fetal arrest in mid-pregnancy is usually delivered naturally in 2-3 weeks, the delivery of the fetus will be contractions, causing abdominal pain symptoms. 3. Vaginal bleeding. If the fetus is not expelled from the uterine cavity for a long time after fetal arrest, it may lead to disseminated intravascular coagulation, which may induce the pregnant woman to suffer from hemorrhage, and usually there will be vaginal bleeding in the early stage of the phenomenon of incessant bleeding. 4. The uterus stops enlarging. After the fetus stops developing in the middle of pregnancy, the uterus will no longer continue to grow, but will shrink due to the decrease in amniotic fluid after the abruption. If the above symptoms appear in the sixth month of pregnancy, you should go to the hospital for ultrasound examination, and terminate the pregnancy in time after the diagnosis of fetal arrest.