Re: swim diapers and swimsuit questions?
When my daughter was that age, I bought her one of those swimsuits from Target. I loved it! I didn't have to put a swim diaper underneath it. Last year she had a regular swimsuit and I always put a sposie swim diaper on her because I didn't want her to use the bathroom in the pool. This year she is potty trained so I don't have to worry about it.
Here is a picture of the swim suit with the built in swim diaper she had from Target (she was a year old).