Walt Disney World operates primarily on an "Honor System" regarding the age of children under 3. In 2026, Disney does not require you to provide a birth certificate, passport, or any physical proof of age for a child you claim is 2 years old (or younger). Children under 3 are "Guests of Mickey" and do not require a park ticket or a park reservation. However, it is important to be honest, as Disney's Cast Members are highly experienced and may strike up a friendly conversation with your child, asking them how old they are. If a child looks significantly older than 2 or if there is a clear discrepancy, a Cast Member may politely inquire further, but they will not demand documentation at the gate. If your child turns 3 during your vacation, Disney policy states they are still considered 2 for the duration of that specific trip. While you won't be "carded" at the entrance, many parents carry a digital photo of their child's birth certificate on their phone just in case an issue arises with airline travel or other off-site activities, even though it isn't needed for Disney entry.