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Autonepiophilia, from the Greek auto (meaning self), nepon (meaning infant), and philia (meaning attachment), is a paraphilia that's also known as "infantilism" or "adult baby/diaper lover." People with autonepiophilia find sexual arousal when brought back to a state of infantilism: crawling, babbling, being fed with a bottle, and wearing diapers.
Autonepiophiliacs are not pedophiles; rather, they look for partners willing to play the role of "mommy," "daddy," or "nurse." They get sexual gratification from acting and being treated like a baby, not from sexual activity with children.
These people are usually of normal, adult intelligence and lead normal, adult lives. However, when it comes to their sexual desires, they seek to regress to an infantile state.
There is very little research to be found on this particular paraphilia given its unusual and underground nature. We do know that men tend to have this paraphilia more often than women, and that studies show that around 58% of men infantilists were heterosexual.
As with all paraphilias, as long as it doesn't interfere with the person's life and normal functioning, these desires can be expressed in a healthy manner.