Baby adults in baby diapers fetish
Paraphilic infantilism - Wikipedia
Inside the adult baby fetish nursery where clients pay to wear nappies and sleep in a cot
Description: Gender Disorders and Paraphilias. A rare case of fetishistic behaviour". Though the categories are discrete, in practice the behaviors found in each group often overlap. This may be due to both the relative rarity of the condition and because few paraphilic infantilists appear to seek professional mental health counseling,   and that even fewer appear to require any type of pro-active mental health intervention.