It is generally summarized as follows: i. Increased risk of uterine adhesions, cervical adhesions, chronic pelvic inflammatory disease, irregular menstruation, and even secondary infertility. Second, it is easy to cause miscarriage after pregnancy. Third, it is easy to have high-risk pregnancy such as placenta praevia, which is caused by uterine meconium dysplasia. Fourth, it is easy to have placental adhesions, placental implantation and postpartum hemorrhage during delivery. The above risks are only possible, not necessarily able to happen. If there is no plan to have children, it is recommended to have good contraception to avoid unwanted pregnancy, which may cause unnecessary impact on body and life.