Within two weeks after delivery, if the bleeding is heavy, especially in the last week, if the bleeding is more than the menstrual flow, ultrasound should be done in time. If it is determined that there is residue in the uterine cavity, and the residue is not very large, you can apply drugs and Chinese medicine to promote uterine contraction, and you can observe it temporarily, sometimes small residue can be expelled naturally. If the residue is still in the uterine cavity after more than two weeks, it is necessary to remove the uterus. If the residue remains in the uterine cavity for a long time, it can cause heavy bleeding or infection in the uterine cavity, which can have a great impact on future fertility.