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I don't think it's a good idea to take a child that is not potty trained into the pools, even the kiddie pools. On one of our Carnival cruises they closed one of the pools down for the day because a child that was not potty trained went in the pool. There were a lot of people that were unhappy because they were not able to use the pool. I personally would not want to be responsible for something like that. I'm sure you can still have a good time with your baby if you're not in the pool. I know that's not what you want to hear but I believe it's for the safety of others. Could be different cruise lines have different policies.