My kids have used their own arm floaties in the resort pools (one year I think they did have their life vests). I seem to remember once reading that flotation devices weren't allowed at the water parks but they do loan out life vests for kids at no charge. Maybe someone else knows more about that. Have fun!!
If you are staying at a resort with "quiet pools" ( DxL-Riverside, CBR & CSR) that are not lifeguard supervised, you can use anything you want. But at the water parks & the main resort pools with lifeguards you must use Disney vests. They are free. At resorts you just ask for 1, at water parks I believe you must leave a deposit which will be refunded.
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