We have the same situation with DD4. Although since she already sees a pediatric urologist for a different issue, I will discuss that with him next month, in case it is something physical. DD8 was so done with diapers by 3, but DD4 is just a different kid.

We have 2 policies
1. There are certain times when you sit on the potty, no matter what. (Leaving the house, for example.)
2. Two pairs of underwear a day, then pull-ups.

Yes, I have often said that pull-ups are the devil, but I simply can't keep up with the laundry generated otherwise. (She refuses to wear the pants she had on *over* the slightly damp underwear, even if they are bone dry.) I've explained to her that the reason for the 2-pairs-a-day rule is laundry -- I don't want it to seem like a punishment, just a basic consequence. We only have so much underwear.

It's frustrating for sure, especially after "we" did such a "good job" with DD8.

Shaun
www.redseahomeschool.wordpress.com