My reason is slightly different, although I remember threats if being put back in nappies as a child it wasn't until I got to 10,11 or 12 when my interest spiked.
My parents used to buy me and my brother a comic annual each a year one of us git a copy of the Beano and the other got a copy of Dandy, we would swap once we had read them.
In these comics there was a surprising amount of mild ABDL content (of course I didn't know at the time). There was several instances of dummies (pacifiers) being forced into mouths, people dressing as infants to avoid being recognised. Quite strange to find so much suspect stories when the comics were not linked to my knowledge.
The biggest influences on my future nappy wearing self was on in which Dennis the Menace was punished for being naughty by being placed in a bonnet, with a dummy and placed in a play pen (I can't recall if a nappy was involved). The comic I post below was the result of my first ever erection and resulted in years of fashioning nappies out of towels.
My interest never went away and as I am soon to be 40 I doubt it ever will.