Generally, Disneyland Resort does not require a formal ID (like a birth certificate or passport) for children when they enter the parks. For children aged 3 to 9 who are using a child’s ticket, a Cast Member may occasionally ask the child's age if they appear older, but they rarely ask for documentation. However, for children under age 3 who are entering for free, Disney reserves the right to ask for proof of age if the child appears significantly older than two. In 2026, while not "required," it is a "pro-tip" to keep a digital photo of the child's birth certificate on your phone just in case of a dispute. The most common time a child might need an ID is when using a specialized Southern California Resident ticket or another age-specific promotion, where proof of residency or eligibility for the purchaser is mandatory. For the purposes of park entry, a valid theme park reservation and a linked ticket in the My Disney Experience app are the primary "credentials" needed for a child.