在美国,早产(37周前分娩)占总分娩数的12.5%。早产不仅会导致新生儿死亡,更会造成各种各样的不良结局。在过去的几十年中,尽管进行了大量研究并实施了各种医学和公共卫生的干预措施,早产的发生却仍呈上升趋势。导致早产增多的最主要原因是母亲和胎儿的状况以及辅助生殖技术带来 In the United States, preterm labor (37 weeks before delivery) accounts for 12.5% ​​of total deliveries. Premature delivery will not only result in neonatal death, but also cause a variety of adverse outcomes. In the past few decades, despite a great deal of research and implementation of various medical and public health interventions, the incidence of preterm birth is still on the rise. The main reason for the increase in preterm birth is the condition of the mother and the fetus as well as assisted reproductive technology