noun
child's face; child-like face; baby face
Refers to a face that looks like a child's, either because it belongs to a child or because an adult has youthful features.
彼は子供顔だから、実年齢より若く見える。
He has a baby face, so he looks younger than his actual age.
その写真には、無邪気な子供顔が写っていた
The photo showed an innocent child's face.