Now granted I do on occasion take my children into the bathroom. I had to use one myself and I saw the best thing. It was a child seat, with saftey harness, strapped to the wall INSIDE the stall.
They have those at our zoo in Denver. They were great when my daughter was younger. I don't remember seeing them at WDW but then I didn't hit every bathroom.
1993 - Off Site
01/27/01 - YC - 7 days
02/03/01 - 7 day Magic Cruise
Next WDW trip Dec. 2001
Disney didn't have anything like this the last time we were there. Graco makes a folding child seat that works great. We always take it with us and my DS does great on it. They sell it at Babies-r-us.