The goal of this study is to assess the efficacy and safety of uterine incision diverticulum repair during repeat cesarean section.The main questions it aims to answer are: * Can this surgical method improve the symptom of menorrhagia？ * Is this procedure safe？ Researchers will compare experimental group(Cesarean section + diverticulum repair group) to control group(Conventional cesarean section group) to see if this surgical method works to treat or improve menorrhagia. Participants will: * randomly assigned 1:1 to the experimental group（repairing uterine diverticula during cesarean section) and the control group （Routine cesarean section without repairing the uterine incision diverticulum） * visit the hospital 42 days after surgery * followed up by telephone 6-12 months after surgery
Age range
18 Years
Sex
FEMALE
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Regularity of postpartum menstrual cycle
Timeframe: Six months after cesarean section