Crossword Genius

React to a baby, maybe

Ross

I believe the answer is:

coo

(Other definitions for coo that I've seen before include "Expression of surprise (by a dove?)" , "Pigeon's sound" , "Murmur, speak softly" , "Soft sound of dove or baby" , "Gosh!" .)

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