Learn what "don't be such a child" means, when people say it, and how to use it naturally in English.

It means the speaker thinks the other person is being immature or unreasonable.
From Married To My Brother’S Ex, Episode 19
Someone tells another person to stop acting immature during a tense exchange.
Use this in a conflict to criticize childish behavior, but it can sound insulting or rude. It is not suitable for polite conversation.
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