What does “out of the mouths of babes” mean?

used when a small child has just said sth that seems very wise or clever

How is “out of the mouths of babes” used?

In His Girl Friday (1940), one line is: “- Out of the mouths of babes. - Hi, babe.”

The clip at the top of this page is from His Girl Friday (1940).

- Out of the mouths of babes. - Hi, babe.

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