Yes, you can and must get your 3-year-old a Magic Key (Disneyland's annual pass) if you want them to have year-round park access. At Disneyland Resort, children under age 3 are free and do not require a ticket. However, once a child turns 3 years old, they are required to have a valid admission ticket or a Magic Key. In 2026, Magic Keys for children cost the same as they do for adults; Disney does not offer a "child discount" for annual passes. If Magic Keys are "off-sale" when your child turns 3, Disney typically allows a 60-day window for you to purchase a key for them at a ticket booth to "link" them to your existing family pass. This ensures that the newest Disney fans in your household can keep up with your park-going traditions without the high cost of individual daily tickets.