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新生儿凡出生体重不足2500g者,不论胎龄大小,成熟度如何,均称为低出生体重儿.低出生体重儿包括早产儿、胎龄在37～不满42周的足月小于胎龄儿和胎龄在42周以上胎盘功能不全的过期产小于胎龄儿.体重低于1500g者称极低出生体重儿,体重低于100Og者称超低出生体重儿.我国曾于1986～1987年对全国29省市自治区1843284名新生儿进行了调查,低出生体重儿的发生率为63.9‰,其中早产儿占44.1%,足月及过期产小于胎龄儿占55.9%.极低出生体重儿占低出生体重儿的7.4%.与发达国家相比(约为100‰)我国的发生率偏低,尤其是早产儿相对更低,发达国家早产儿占低出生体重儿的2/3,且体重小于1000g者较多.
Newborns who birth weight less than 2500g, regardless of gestational age, maturity, are called low birth weight children.Low birth weight children, including premature children, gestational age at 37 ~ less than 42 weeks of full-term children less than gestational age and Placental age over 42 weeks of placental insufficiency overproduction of less than gestational age children weighing less than 1500g were said to have very low birth weight children weighing less than 100Og were said to have low birth weight children in China from 1986 to 1987 on the national In the 29 provinces and autonomous regions, 1,884,284 newborns were investigated, the incidence of low birth weight infants was 63.9 ‰, of which 44.1% were premature infants, with full-term and over-term births less than gestational age accounted for 55.9% .Low birth weight children accounted for low 7.4% of birth weight children compared with developed countries (about 100 ‰), the incidence of our country is low, especially in premature children is relatively low, premature children in developed countries accounted for 2/3 of low birth weight children, and weight less than 1000g more.