I have namechanged as I think it's possible friend lurks here.
Today I went to the park with my dc after school. Friend arrived with her dc (dd 6, and ds 2.5). As soon as she arrived she said "please excuse the smell but ds did a pooh just before I came to school to collect dd." this was 20 minutes earlier and she lives a 10 min walk from school so her ds had already been in a dirty nappy for half an hour by then.
So we all stood in the park and chatted and chatted while the children played. We were there for about an hour. Then she said "well I'd better go home and change ds." So this child had been running around the park, sliding up and down the slide, climbing around etc, all the while being in a dirty nappy .
Imo it's one thing if kids have a pooh while they're off playing and parents are oblivious, but to leave a child playing in a dirty nappy for an hour and a half?
ibu to be a bit about this?