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小于胎龄儿(small for gestational age,SGA)是指出生体质量低于同胎龄正常平均体质量的第10百分位者,其出生后,脱离宫内不良生长环境,生长速度可能较同龄儿童加快,生长曲线逐渐回到受损之前或遗传所确定的生长轨道上,即出现追赶生长。SGA儿童在生后1年内,大多数会出现明显的生长追赶现象,即生长加速,但是仍有10%~15%的SGA在2岁时不能追赶至正常范围。婴儿生后的生长也受到外界生活环境、家庭经济状况、饮食摄入情况以及疾病等
Small for gestational age (SGA) refers to the birth weight lower than the normal average body mass with the gestational age of the 10th percentile, after birth, out of the intrauterine poor growth environment, the growth rate may be more children of the same age Speed up, the growth curve gradually returns to the damaged growth or genetic determination of the growth track, that is catch up with growth. The majority of children with SGA develop a fast growing catch-up within 1 year of birth, but 10% to 15% of SGA still can not catch up to the normal range at 2 years of age. The growth of an infant is also influenced by the living environment, family financial status, dietary intake, illness, etc.