Abstract Background This study aimed to explore the association of the second birth delivery mode and interval with maternal pelvic floor changes. Methods This prospective cohort study included women who had a first delivery and were in weeks 36–41 of a subsequent pregnancy at Panzhihua Central Hospital between July 2017 and June 2018. The primary outcomes of the study were the hiatus area at 6 months postpartum and bladder neck (mm) at rest and during a maximum Valsalva maneuver. Results There were 112 women with vaginal delivery and 182 with Cesarean section. The hiatus area and hiatus circumference decreased at all time points (all P
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