see themselves as adults who are drawn to wearing diapers. infantilism or autonepiophilia and paraphilic diaper-wearing.
Those who enjoy diapers and/or babyhood are called Adult Babies or Diaper Lovers (AB/DLs or ABDL s). ABDLs don't necessarily have either.
Looking for online definition of Adult infantilism in the Medical Dictionary? baby bottle, sleeping in an oversized crib, playing in a playpen and wearing diapers.