早产儿指股龄不足37周的活产婴儿。由于早产，各器官的生理功能尚不够成熟，呼吸中枢发育不完善，呼吸不规则，并常出现暂停现象。早产儿肺发育不成熟，并有凝血机制不健全，易发生肺透明膜病和肺出血。不少早产儿有宫内窘迫史，易发生吸入性肺炎。以上均可使早产儿发生缺氧和 Premature babies are those born less than 37 weeks old. Due to premature delivery, the physiological function of various organs is not yet mature enough, the development of the respiratory center imperfect, irregular breathing, and often suspended phenomenon. Premature children with immature lung development, and clotting mechanism is not perfect, prone to hyaline membrane disease and pulmonary hemorrhage. Many premature children have intrauterine distress history, prone to aspiration pneumonia. These can make hypoxia and premature children