Theme park tickets are free for children under 3-years old. And to answer your question, you do not need to make theme park reservations for a child of this age either.

At Disneyland Resort, children under the age of 3 (specifically ages 0, 1, and 2) do not require a theme park ticket or a theme park reservation to enter. They are considered guests of the Walt Disney Company and may enter for free as long as they are accompanied by a guest with valid admission and a reservation. Once a child celebrates their third birthday, they are legally required to have a valid ticket and a corresponding park reservation for every day of their visit. In 2026, Disney continues to use a tiered pricing system where children ages 3 to 9 typically qualify for a slightly discounted "Child" ticket compared to the "Adult" price for those aged 10 and older. Parents should be prepared to verify their child's age if asked at the gate, though Disney generally operates on an honor system. For toddlers under 3, this free admission also extends to "all-you-care-to-enjoy" character dining locations, where they can eat for free from an adult's plate or receive their own simplified meal.