Hi Stephanie,
I think you will be pleasantly surprised to see just how much your little one will be able to enjoy at Walt Disney World. There are so many attractions that the entire family can experience together. Of course, everyone thinks of small children when Fantasyland at the Magic Kingdom is mentioned: it's a small world, Dumbo, Peter Pan's Magic Flight and Cinderella's Golden Carousel are all popular attractions for young and old, alike.
Your fun won't be limited to just Fantasyland though, or just to the Magic Kingdom. You'll be able to enjoy Jungle Cruise, Pirates of the Caribbean and Buzz Lightyear's Space Ranger Spin in Magic Kingdom. In Epcot, try Spaceship Earth, The Living Seas with Nemo and Friends and Journey Into Your Imagination. At Animal Kingdom be sure to ride Kilimanjaro Safari and explore both the Pagani Forest Trail and Maharajah Jungle Trek. Your little one will also want to check out the Boneyard and take a whirl on Triceratops Spin. At Hollywood Studios the whole family will enjoy Toy Story Midway Mania, and if your little one is a Playhouse Disney fan, be sure to check out the live stage show.
Besides attractions, there are several live stage shows and parades at each park. Also, there are interactive fountains and small play areas located throughout the parks. There is so much to see and do for children of this age. It truly is a magical place.
Of course there are a few attractions that your little one cannot enjoy at this age, for safety reasons. Click
HERE for a list of attractions with height requirements.
Hope this helps. Have a magical vacation!