noun
child's mind; childish heart; innocent mind
Refers to the innocent, pure, or naive way of thinking and feeling characteristic of a child. Often used in contexts of nostalgia or when describing someone's childlike perspective.
大人になっても子供心を忘れたくない。
Even as an adult, I don't want to lose my childlike heart.
その話を聞いて、彼は子供
Hearing that story, he was moved with a child's innocent heart.