Definition of 「児」:
1. Same as "兒".
(Originally pictographic. The shape in Oracle Bone Script features the character "人" at the bottom, with the top resembling a small child crying and laughing. "兒" is one of the radicals in Chinese characters, and most characters derived from "兒" relate to "人". The primary meaning is: infant. In ancient times, boys were called "兒", girls were called "嬰", and later all children were referred to as "兒".)
同本義,兒,孺子也。——《說文》
(Same original meaning, "兒" also refers to a child. — from "Shuowen Jiezi")