Just wanted to mention that when DD was 4, say 6 months ago or more, she went through a period of having wet underpants -- like just a tiny leak. I kept finding underwear on the bathroom floor, and she'd be running around with none.

It seemed to resolve itself with some renewed attention to using the potty at regular times for a bit, but I still suspect that there was some kind of surface irritation going on. I think that can cause little problems like that.

Shaun