What is the deal on swim diapers at the pools and water parks? When we go in September, I'll have a boy three months shy of three. I really think he could be potty-trained b/c he is already going on the potty, but if he isn't totally and I put a swim diaper on him, will he be unable to go in the big pool at WL and the activities at Typhoon Lagoon? He is a big boy with a big sister and it will kill him to see her doing stuff he can't do.