超低出生体重儿(E LB W婴儿)是指出生体重低于1000g的新生儿,通常是胎龄较小(28周)的早产儿。美国1997年E LB W婴儿占低出生体重儿(LB W婴儿)的10%。随着围产医学、新生儿医学的发展,E L B W婴儿存活增加,救治的婴儿胎龄已达23周甚至以下。出生体重501～750g、751～1000gE LB EWW babies are newborns with a birth weight of less than 1000g and are usually premature babies of a smaller gestational age (28 weeks). The United States in 1997 E LB W babies accounted for 10% of low birth weight children (LB W babies). With the development of perinatal medicine and newborn medicine, babies with EBW have survived, and gestational age has reached 23 weeks or less. Birth weight 501 ~ 750g, 751 ~ 1000gE LB