infantilist 

A person whom wears diapers and likes to be treated like a baby. Inside the mind of an infantilist he or she is a infant/baby.

www.dpf.com Go to this site for it will explain a lot about Diaper Lovers and Adult Babies.

infantilist by Baby Pink April 27, 2005

infantilist 

some fucking messed up, freaky shit

i wear diapers and hypnotize myself to shit myself and pee all over me.

infantilist by ginny March 10, 2005

Infantilism 

Enjoyment from infant-related things. Pretending to be a baby, wearing diapers (see diaper lover, speaking like a child (ie "I sowwy"), sleeping in a crib. Wide range of things, but all infant-related

Note that this is interest in the trappings/behaviour of youth, not sexual interest in the youth themselves (that's a pedophile)

Infantilism by Anonymous March 20, 2003

infantilize

verb trans.

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

jimmy infantilizes his friends all the time

infantilize by jeny September 11, 2007

Paraphilic Infantilism 

A fetish where people dress up like babies

My son's preschool teacher is into Paraphilic Infantilism and often wears diapers under his pants.

Paraphilic Infantilism by Chodeyjones42 April 20, 2015

Infantilize

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

Infantilize by BGC September 3, 2007