The pregnancy sac stays in after fetal reduction surgery, which is usually recommended to be treated conservatively and may be absorbed slowly. After a woman undergoes fetal reduction surgery, there is a chance that the gestational sac will flow out of the vagina. If it does not flow out of the vagina, there is a possibility that it will be slowly absorbed by other tissues, or in the form of a paper-like attachment to another sac. Women are advised that they need to take care of bed rest and minimize their activities as much as possible, and they also need to observe the changes in their body. For residual pregnancy sacs, only continuous observation is allowed, as pregnant women are not allowed to undergo surgical treatment for removal of the uterus, otherwise the fetus in the uterine cavity will be affected. If a woman observes that there are uncomfortable symptoms in her body, such as persistent vaginal bleeding and other symptoms, she needs to go to a regular hospital as early as possible to receive examination and treatment, to be clearly diagnosed by the doctor, and cooperate with the doctor to deal with the symptoms. Pregnant women should pay attention to the prenatal examination during pregnancy, actively listen to the advice of professional doctors to do a comprehensive nursing care, pay attention to more rest, at the same time should be relaxed, to avoid tension, anxiety.