Several years ago, I was at a beach park and I had to go to the public restroom to pee. To get to the urinals, one has to pass through the changing area, and as I was about to pass through, I heard a crinkling noise. Sure enough, as I turned the corner I saw a boy, who was a bit chubbby, and about 10 years old taking off a disposable diaper. I was shocked, but didn't linger, and went off to the urinals to pee. After I finished, I had to exit through the changing area, and the boy was still there, this time putting on a new diaper. There were other people there, who were showering and changing out of their bathing suits, but this boy went along with his diaper changing as if it was perfectly normal. I saw him later with his family, playing around with some other kids with a noticeable bulge in his swimming trunks.