low birth weight infant

...A birth before 24 weeks of pregnancy where the baby cannot survive is called a miscarriage, a birth between 24 and 37 weeks is called a preterm delivery, a birth between 37 and 42 weeks is called a term delivery, and a birth over 42 weeks is called a postterm delivery. Until 1978, a birth weight of 2500g or less was called a premature baby, but because weight and immaturity do not necessarily correlate, a birth weight of less than 2500g came to be called a low birth weight infant. The average gestation period in humans is 280 days, but in animals it is as shown in Table 1. ...

*Some of the terminology that refers to "low birth weight infant" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…妊娠24週未満の児の生存が不可能な出産は流産とし，24週から37週未満を早産preterm delivery,37週から42週未満を正期産term delivery,42週以上を過期産postterm deliveryという。1978年までは出産体重2500g以下を未熟児と呼んでいたが，体重と未熟性とは必ずしも平衡しないことから，出産体重2500g未満を低出産体重児low birth weight infantと呼ぶことになった。平均妊娠期間は，ヒトでは平均280日であるが，動物では表1のとおりである。…

※「low birth weight infant」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報