Hi Monica,
Welcome to Disney Parks Moms Panel. First, I want to say that now we have Disney Parks Moms Panel in Portuguese. So you can ask us anything regarding Disney Destinations in our own language. Cool, right? At water parks and theme parks, attractions that says any height, means that kids with no minimum height are welcome to participate. Sometimes an adult must accompany them. Just like in the theme parks, many of the attractions at the water parks do have height requirements. For example, at Blizzard Beach, four of the twelve attractions have height minimums. And they range from 32″ for the chairlift to 48″ for the major slides, Summit Plummet and Slush Gusher. At some attractions at Water Parks keep in mind that it may require some additional work on from the parents. For example, children of all ages are welcome to participate in the water parks’ lazy rivers. But, if you are taking your young one into the lazy river, you are going to have to maintain a tight grip on him for the duration of the experience, which may involve bumps by other guests, rafts, loud teens, flowing water, and overhead drenching. As a parent with a small child, you have to watch your kids closely and constantly. With an almost four little girl is no different.
Have fun at WDW!
Camila R.