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在一个相当长的期间,人们曾普遍把出生体重2,500克作为分界线来区分足月儿或早产儿,凡低于2,500克者称为早产儿,反之则称为足月儿。但实践表明,相同胎龄新生儿的出生体重有较大的差异,出生体重低于2,500克的新生儿中有1/3～1/2为足月儿,还有些早产儿出生体重却高于2,500克。鉴于此,国际上已摒弃这种分类法。
For a fairly long period of time, it has been widely accepted that the birth weight of 2,500 grams is used as the dividing line to distinguish term infants or premature infants, those below 2,500 grams are referred to as premature infants and conversely term infants. However, practice shows that there is a big difference in the birth weight of newborns of the same gestational age. One-third to one-half of newborns with birth weights less than 2,500 grams are full-term children, while others have a higher birth weight than 2,500 grams. In view of this, this taxonomy has been abandoned internationally.