If I saw anyone, adult or child wearing a diaper in the hot tub, I would have to complain loudly. Not only is this a health hazard to everyone else who uses the hot tub, it is disgusting! It`s the equivalent of sitting in a toilet, have some consideration for your fellow cruisers and stay out if you can`t control your bladder. As far as babies are concerned they have no buisness being in the hot tub at all. I would not hesitate to report anyone doing so!