No, a child who is 2 years old does not need a ticket to enter Magic Kingdom or any other Walt Disney World or Disneyland theme park. Disney’s official policy states that children under the age of 3 (ages 0, 1, and 2) receive free admission. This is one of the biggest "money-savers" for young families, as a standard 1-day ticket for a child aged 3–9 can cost well over $150. Your 2-year-old also does not need a "Theme Park Reservation" if you are visiting on a day where reservations are required for other guests. When you arrive at the turnstiles, you simply push your child through in their stroller or carry them; the cast member will not ask for a ticket for them. You also do not typically need to provide a birth certificate to prove their age, as Disney operates on an "honor system," though if your child is exceptionally tall for their age, it doesn't hurt to have a photo of their ID on your phone just in case. Furthermore, a 2-year-old can eat for free from an adult's plate at "All-You-Care-To-Enjoy" family-style or buffet restaurants like Chef Mickey's or Crystal Palace, making age two the "golden year" for a Disney vacation.