Generally, a birth certificate is not required for standard entry into Walt Disney World for children or adults. However, there is a "High-Fidelity" exception: if you are a Florida resident using a "Preschool Card" or certain age-restricted resident offers, you may be asked to provide a certified copy of a birth certificate or a passport to verify the child's age (usually for those aged 5 and under) at the time of activation. For international guests or those traveling by air, a passport or government-issued photo ID is the standard requirement. Disney typically operates on an "honor system" for children under 3 (who get in for free), but if a child appears significantly older than their stated age, having a digital copy of their birth certificate on your phone is a high-fidelity safety net to avoid disputes at the turnstiles. For adults, a standard driver's license or passport is all that is needed to verify identity for ticket pick-up or "High-Fidelity" alcohol purchases within the parks.