1概念与流行病学宫内生长迟缓(IUGR)是指胎儿的生长发育因各种原因未能达到其基因所决定的生长发育程度[1]。但这一概念在临床实践中无法应用,其命名与概念通常与小于胎龄儿(SGA)互用。后者是一个统计学概念,是指一组出生体重低于相应胎龄第10百分位数的新生儿。不同作者有不同 1 concept and epidemiology Intrauterine growth retardation (IUGR) refers to the growth and development of the fetus due to various reasons failed to achieve its genetically determined degree of growth and development [1]. However, this concept can not be applied in clinical practice, and its naming and concept are usually inter-working with SGA. The latter is a statistical concept and refers to a group of newborns whose birth weights are below the 10th percentile of the corresponding gestational age. Different authors have different