Infantilize

[Raeanne Dimick]

to treat someone as if that person were a child, with the result that they start behaving like one:

[Lanell]

Treat (someone) as a child or in a way which denies their maturity in age or experience.

[Marquetta]

[Not a word]. Some may think it is. But no, [tis] [not a word].

[Rihanna]

verb [trans].

to treat someone as a child or [in a way] that denies their [maturity]