Hello, Justina! It's so great that you are bringing your little one to the Disneyland Resort. He is going to have the time of his life!
My daughter has always been very tall for her age and people are often astonished when we tell them her age. However, we have never had a problem bringing her to the parks when she was under 3 years old and didn't require theme park admission. You might be asked your son's age by a Cast Member, but you shouldn't need to provide any supporting documentation. If you are especially concerned, you could bring along a copy of his birth certificate just in case.
There are several
attractions at the Disneyland Resort that I think your little one might enjoy. When my daughter was 2 years old, her favorites included Casey Jr. Circus Train, Dumbo the Flying Elephant, Pirates of the Caribbean, and just about everything in "a bug's land." Keep in mind that since your son is tall, he may be able to ride some attractions with shorter height restrictions. Some rides like
Luigi's Rollickin' Roadsters and
Mater's Junkyard Jamboree (both have 32" height requirements) would be great for a 2-year-old, but
Gadget's Go Coaster (35" height requirement) might be a bit too wild. You may want to read about the different attractions to see which ones would be the most appropriate.
I hope you and your family have a wonderful time at the Disneyland Resort!
-Linda M.