早产是指满28孕周至37孕周之间(196～258天)的分娩。在此期间出生且体重在1000～2499克、身体各器官生长未成熟的新生儿,称为早产儿。早产儿死亡率高,常见的死亡原因有:窒息、颅内出血、畸形等。因此,防止早产是降低新生儿死亡率的重要措施之一。一、引起早产的常见原因⒈孕妇 Premature delivery refers to the delivery of milk between the 28th gestational week and 37th gestational week (196 to 258 days). During this period was born and weighing 1000 to 2499 grams, the growth of organs of immature newborn, known as premature children. Premature infant mortality, common causes of death are: asphyxia, intracranial hemorrhage, deformity and so on. Therefore, preventing premature birth is one of the important measures to reduce neonatal mortality. A common cause of preterm birth ⒈ pregnant women