晚期早产儿是指34周≤胎龄<37周、更接近成熟足月的新生儿[1],晚期早产儿发生疾病和死亡的风险低于早期早产儿,但他们尚处于生长发育不成熟阶段,患病率、死亡率均明显高于足月儿,因此近年来成为临床研究的热点问题之一。晚期早产儿各器官发育不成熟,易出现多种并发症。据报道,晚期早产儿入住NICU率、剖腹产率、双胎、呼吸困 Late preterm birth refers to 34 weeks ≤ gestational age <37 weeks, more mature full-term newborns [1], the risk of disease and death in late preterm infants is lower than that of early preterm infants, but they are still in the immature stage of growth and development , Prevalence and mortality were significantly higher than full-term children, it has become one of the hot issues in clinical research in recent years. Early premature infants, various organs immature, prone to a variety of complications. It is reported that NICU rate of late preterm infants, caesarean section, twins, breathing difficulties