In the ABDL lifestyle there are some people who have become a part of the lifestyle due to having medical challenges, and a common one that does appear are for individuals who were once bedwetters.
Often times the trauma associated with bed wetting and having diapers as need created an emotional attachment for some even up into their adult hood. For some adults they still may have challenges with bed wetting also known as nighttime incontinence.
Disclaimer: In my channel I do not support minors or children in Kink lifestyles or communities. I do not believe that children or minors belong in situations to be taken advantage of by adults. I believe in consensual relationships and safe play between adults only.