新生儿出生体重<2500g称为低出生体重儿(LBWI)[1]。LBWI对外界环境适应力差、抵抗力低,患病率与死亡率高于正常出生体重儿,且出生体重越低,发生脑出血等后遗症的几率越高,影响婴幼儿日后智力发育和社会适应能力[2]。LBWI发生率是新生儿出生质量和健康状况的重要指标,是反映一个国家或地区卫生经济水平与妇幼保健状况的重要指标。 Neonatal birth weight <2500g called low birth weight children (LBWI) [1]. LBWI adaptability to the outside world is poor, low resistance, prevalence and mortality were higher than normal birth weight, and the birth weight is lower, the higher the risk of sequelae such as cerebral hemorrhage, affecting the infant’s future intellectual development and social adaptation Ability [2]. The incidence of LBWI is an important indicator of birth quality and health status of newborns and an important indicator of health status of maternal and child health in a country or region.