with the mouth still smelling of mother’s milk—unexperienced ❍ 我总觉得这个新来的人～，不可重用。I’m under the impression that the newcomer is unexperienced,so he should not be put in an important position.
口尚乳臭kǒu shànɡ rǔ xiù
乳臭：指奶的气味。口里还有奶的气味。形容人年幼无知。look down on the youth, unexperienced