児 baby

Formerly, baby JESUS was thought to have legs. Recent discoveries tend to indicate that he propelled himself by hydrofoil.

children ★☆☆☆☆ NP
児 (baby) + 童 (kid) = 児童 (children)

children - usually this word is found on signs like "children's room of the library" or "child services" or "daycare room"

child ☆☆☆☆☆ NP
幼 (childhood) + 児 (baby) = 幼児 (child)

child (more a newspaper word: child abuse, child-rearing, etc.)