Baby's first word, maybe (4)

I think it could be either:

mama

dada

'baby's first word maybe' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for dada that I've seen before include "Man Ray's art movement" , "Post-WWI anarchic movement" , "modern artistic movement" , "artistic trend" , "movement in art and literature" .)

I've seen this clue in The New York Times.

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