I first knew when I was 4 or 5. I'd stopped wetting the bed, but I began to miss wearing Pull-Ups, so I put one on and really enjoyed it. At one point when I was 5, my dad took me to a coworker's house, and they caught me in the baby's room trying to put on a diaper. When I was 6, whenever I passed by babies at grocery stores, I'd always ask the parent(s) what diapers the babies wear. When I was 7 and 8, my class went to a room the lower floor of my school (where the lower functioning autistic classrooms were) for certain activities. When I went to the bathroom on that floor, I 'd always use this large stall where they kept diapers for the students, and I'd try them on.