Crossword Genius

An infantile thing to do (6)

Ross

I believe the answer is:

teethe

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'do' is the definition.
The answer and definition can be both related to bodily activities as well as being verbs in their base form.
Maybe there's a link between them I don't understand?

I don't understand how the remainder of the clue works.

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(Other definitions for teethe that I've seen before include "Of baby, having first gum growth" , "Cut one's first ivories" , "Experience growing pains" , "Develop gnashers" , "(Of baby) have gum pain" .)

I've seen this clue in the Evening Standard.
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