Preterm birth is the most common cause of death in infants worldwide, but the cause of preterm birth is often unknown. Among other risk factors—such as high blood pressure, being pregnant with more than one baby, and some vaginal infections—maternal obesity has been associated with preterm birth. Maternal obesity increases the risk of gestational diabetes and hypertensive disorders that contribute to medically indicated preterm birth.

中文翻译：

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产妇肥胖对早产的因果影响。

早产是全世界婴儿中最常见的死亡原因，但早产的原因通常是未知的。除其他危险因素外，例如高血压，怀孕多于一个婴儿以及一些阴道感染，孕妇肥胖与早产有关。孕妇肥胖会增加妊娠糖尿病和高血压疾病的风险，这些疾病会导致医学上早产。