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小于胎龄儿(SGA)是由于宫内慢性缺氧和营养不良引起胎儿生长发育障碍。这类新生儿可以是早产儿、足月儿或过期产儿。一般将出生体重小于该胎龄正常体重第10百分位或以下或较平均数低二个标准差以下者称为小于胎龄儿,出生体重在第3个百分位
Small gestational age (SGA) is due to intrauterine chronic hypoxia and malnutrition caused by fetal growth and development disorders. Such newborns can be premature children, term infants or children who are overdue. Generally less than the birth weight of the gestational age normal weight below the 10th percentile or below average or less than two standard deviations less known as less than gestational age, birth weight in the third percentile