Obstruction can lead to prolonged labour, which increases the risk of caesarean section, heavy bleeding, distress in the infant and stillbirth.

阻塞可能使分娩时间延长，从而增加剖腹产、大出血、婴儿窘迫和死产的危险。

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Obstruction can lead to prolonged labour, which increases the risk of caesarean section, heavy bleeding, distress in the infant and stillbirth.

阻塞可能使分娩时间延长，从而增加剖腹产、大出血、婴儿窘迫和死产的危险。

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