Anonymous wrote:We use a swim diaper (i-play or other reusable one) with baby swim suit over it. We've never been questioned
We do the same. The iPlay diapers hold poop in well (sadly, I have experience). We didn't even notice until we were out of the pool--nothing "came out." No swim diaper is going to hold in pee, so wait until you get to the pool to change into it. I like iPlays because they have a tiny bit of absorbancy, so if my kid pees a little, it won't drain right through. With disposables, it's like holding a piece of cloth under the faucet.
I did plastic pants over the iPlay for our first class last year and saw that nobody else was using them, so I stopped.