Fetal termination is also known as fetal arrest, and the yolk sac will not change from one to two after a long period of fetal arrest. After pregnancy, the fetus has stopped developing in the uterus, the yolk sac will no longer change, but slowly shrink and become smaller, the yolk sac will not change from one to two. The yolk sac is a richly vascularized capsule located on the ventral side of the embryo surrounded by the yolk. The yolk sac is a sign of an early gestational sac, and if there is no yolk sac, there will be no fetal buds or fetal heartbeat, which means that it is an empty gestational sac, and is considered to be the result of embryonic underdevelopment. Under normal circumstances, the yolk sac can appear in about five weeks of pregnancy, and the buds and fetal heart can appear in six to seven weeks. Fetal termination should be dealt with in a timely manner in the hospital, and should not be left untreated for a long period of time. Dead embryos are prone to mechanized calcification attached to the uterine wall, which affects the growth of the uterine lining, and will have an adverse effect on the next pregnancy, as well as increase the risk of intrauterine infections and hemorrhage. After the pregnancy to determine the fetal arrest, to go to the hospital in a timely manner to deal with clean through the removal of the uterus surgery.