Treating someone like a child; behaving toward someone as if they are immature or not to be taken seriously.
「子供扱いしないで」と彼女は怒って言った。
"Don't treat me like a child," she said angrily.
上司に子供扱いされて、やる気をなくした。
I lost motivation after being treated like a child by my boss.
年齢より経験で判断してほしい。子供扱いはやめてほしい。
I want to be judged by experience rather than age. I don't want to be treated like a child.