All guests 2 and under enter for free. Certain ticket types (for example, Annual Passes) are offered with just one price for all guests. For these products, there is no height-based nor age-based discount version.

At Universal Studios theme parks (including Orlando, Hollywood, Japan, and Beijing), children under the age of 3 are admitted for free. This means that if a child has not yet reached their third birthday, they do not require an admission ticket or a reservation to enter the parks. Once a child turns 3, they are required to have a "Child" category ticket, which generally applies to children between the ages of 3 and 9. Upon reaching their 10th birthday, guests are required to purchase an "Adult" category ticket at the full price. In 2026, Universal remains strict about these age brackets; while they rarely ask for a birth certificate at the gate, they may ask the child their age if there is a discrepancy. For parents traveling with infants or toddlers, the free admission for those under 3 is a significant cost saver, especially since these younger guests can also experience many of the "no-height-requirement" attractions, such as the Hogwarts Express or various play areas, without any additional fee, provided they are accompanied by a ticketed adult.