Some will be expelled naturally after fetal arrest, some will not and need to be cleared. After fetal arrest, the death of embryo, infection and other factors will induce contractions and naturally expel the intrauterine gestational material, but in some cases, the arrest is long and the gestational material is adherent to the uterine wall, so it is not easy to be expelled naturally. The embryo stops developing and is not discharged on its own within a short period of time, but some substances on the embryo as well as cells or tissues that have already degenerated and died will be released, which can easily cause abnormalities in coagulation and easily lead to the risk of having hemorrhage, which can endanger the life of the pregnant woman in serious cases. If the embryonic tissues are not expelled from the body for more than 3 weeks after the fetal arrest, then it is necessary to go to the hospital in time to carry out purging to remove the residues in the uterus, and cannot wait for the natural expulsion. If the patient does not have natural expulsion after too long a period of time after fetal arrest, she should go to the hospital in time to avoid delaying her condition.