If menstruation is regular before pregnancy, the absence of fetal heartbeat after the 7th week of pregnancy can be recognized as fetal arrest; if menstruation is not regular, there are individual differences. For women with regular menstruation, fetal buds can be seen on vaginal ultrasound in the 6th week of pregnancy, and fetal heart can be seen in the 7th week of pregnancy. If the primitive cardiac tube is still not seen after the 7th week of pregnancy, and the egg is crumpled, the diagnosis can be made as fetal arrest. Some women have irregular menstruation, if ovulation and conception are late, it will lead to delayed development of the embryo, and the appearance of fetal heart will also be delayed, it is normal that the fetal heart is not detected before the 7th week of gestation, and it is recommended to review the vaginal ultrasound after 1-2 weeks. If the diagnosis is clear, the pregnancy should be terminated by abortion or induced abortion. Pregnant women should follow the doctor’s instructions to the hospital for regular prenatal checkups, and pregnant women who are in a position to do so can also monitor their own fetal heartbeat at home, and if abnormalities are detected, they should go to the hospital obstetrics department in time for testing and treatment.