The Adult Baby Diaper Lover (ABDL) community on 4chan is one of the site's more...niche groups. ABDL refers to adults who have an interest in role-playing as infants or toddlers, often incorporating the use of diapers into their practices. This can involve a range of activities, from wearing diapers and engaging in caregiver or role-play scenarios to a deeper psychological identification with being an adult baby.