Hi JenMax, we just returned from cruising on the Liberty and I saw young children swimming in the kiddie pool, and from their young ages, I know a few of them had pull ups or swimmers on. Last year we cruised on the Triumph w. our three grandchildren and two of them still wore swimmers in the pool and no one said anything to us. I don't think you will have a problem. Hope you have a great time - we sure did. The Liberty is an awsome ship.