孕前体重过重或孕期体重增加过多均会导致剖宫产率增加、产程延长、引产率及器械助产率增加。孕妇体重增加其巨大儿发生率、肩难产发生率、产伤的发生率增高。肥胖导致内分泌异常、引产失败率增高、产程进展异常等均是影响分娩方式重要因素。 Overweight before pregnancy or too much weight during pregnancy can lead to an increase in cesarean section rate, prolonged labor, and a rise in induction and delivery rates. Increased weight of pregnant women its incidence of giant children, the incidence of shoulder dystocia, the incidence of birth trauma increased. Obesity lead to endocrine abnormalities, increased failure rate of induction of labor, abnormal progress of labor and so on are important factors that affect the mode of delivery.