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1.
verb trans.

to treat someone as a child or in a way that denies their maturity
jimmy infantilizes his friends all the time
by jeny September 02, 2007
 
2.
Not a word. Some may think it is. But no, tis not a word.
GSM: Don't infantilize me
me: that's NOT a word
by BGC August 27, 2007