Abstract: Objective To investigate the status and influencing factors of pelvic floor function at 42 days postpartum in women with natural delivery. Methods From January 2018 to December 2020, the parturients who delivered naturally in the obstetrics department of a hospital in Nanjing and received postpartum specialized outpatient medical examination at 42 days postpartum were selected, to investigate the basic condition of mother and baby and analyze the influencing factors of pelvic floor function at 42 days postpartum using Logistic regression analysis. Results A total of 1 984 parturients were studied, aged 20-41 years old, with an average age of （28.53±6.44） years old; their gestational week of delivery was 37-42 weeks, and their average gestational week was （38.49±1.43） weeks. Among 1 984 parturients, 1 549 cases （78.07%） had abnormal pelvic floor function, and the abnormal rate of muscle strength of type I and type II muscle, fatigue of type I and type II muscle, and static pressure value of vaginal wall exceeded 60%. The results of multivariate Logistic regression analysis showed that age ≥ 35 years old （OR=1.527）, twice or more pregnancies （OR=2.155）, twice or more deliveries （OR=2.467）, birth weight of newborn ≥4.0 kg （OR = 3.086）, weight gain during pregnancy higher than the recommended standard （OR = 2.130）, gestational week of delivery> 40 weeks （OR = 1.654） were risk factors for abnormal pelvic floor function at 42 days postpartum in natural delivered women. Conclusion The abnormal rate of pelvic floor function at 42 days postpartum in natural delivered women is relatively high. Factors such as age, gravidity, parity, birth weight of newborn, weight gain during pregnancy, and gestational week of delivery can affect the pelvic floor function of natural delivered women. Obstetricians should guide pregnant women to make a good pregnancy management, reduce the occurrence of abnormal pelvic floor function in the early postpartum period, and promote maternal postpartum rehabilitation.

Key words: Natural delivery, Pelvic floor function, Influencing factor, Parturient