孩がい児じがいじMeanings1nouninfant; babyarchaicArchaic term for a very young child; not used in modern Japanese outside historical or literary contexts. Modern equivalents include 赤ちゃん or 幼児.古こ文ぶん書しょに「孩がい児じ」と記しるされているが、今いまでは「赤あかちゃん」と言いう。In old documents it is written as 孩児, but nowadays we say 赤ちゃん.