Potty trained child retreating...

[lookout123]

OK, so my son - the extremely strongwilled one from the other thread? He's got a little issue and I'm having a hard time dealing with it effectively.

He will be 4 in June and has been 100% potty trained since he was 20 months. No accidents in all that time. When it comes to his body he is a clean freak, just like me. until now.

He is having a little problem peeing in his pants. It has happened once a day for going on 2 weeks now. He doesn't go much - in fact, if he wasn't so horrified with the little bit of wetness there i wouldn't even bother to change his undies because it is so little. He will be sitting in the middle of the room and then get this panicked look on his face and run to the bathroom, but it is too late. When we talk about it he says that he was playing, or drawing, or whatever and it just snuck up on him. He isn't doing it on purpose or to make a point - he just gets too wrapped up in what he's doing until it is too late.

Has anyone run into this before? Is it normal? or might he have a little bladder infection that causes this? any ideas on how to get him to pay more attention?

the boy is horrified and embarrassed about it. my wife asks me about it and i'm clueless. i don't have any other kids and i'm almost 31 so i haven't peed my own pants for at least a month or two, so i don't know exactly what is happening here.