小于胎龄儿(SGA)出生时比体重相同的适于胎龄儿(AGA)更为成熟。SGA儿是否和胎龄较大的同类婴儿一样,或是否具有和宫内生长障碍相关的特殊变化,这些问题在阐明这类婴儿的特殊需要方面是有趣的。国立儿童健康和人类发展研究所的光疗研究收集了大批量新生儿,可以对它们的出生体重、出生时胎龄以及宫内生长进行详尽的分析。出生时体重≥2000g、而且发生黄疸 Smaller than gestational age (SGA) birth than the same weight for gestational age children (AGA) more mature. Whether SGA babies have the same special changes associated with intrauterine growth disorders as those of older infants, and these issues are interesting in elucidating the particular needs of such babies. Phototherapy research conducted by the National Institute of Child Health and Human Development collects high volumes of newborns and gives a detailed analysis of their birth weight, gestational age at birth, and intrauterine growth. Birth weight ≥ 2000g, and the occurrence of jaundice