Hi Alicia,
I remember visiting Walt Disney World with my daughter when she was very young. It is so wonderful to see the magic through a little one's eyes! Let me offer you some tips for traveling with your young one.
While I believe that there is something for infants and toddlers at every Disney theme park, if you have to choose only one, I would recommend
Magic Kingdom. There are just so many experiences for little ones there! Fantasyland is filled with visually and musically rich attractions such as it's a small world, Peter Pan's Flight, and Dumbo the Flying Elephant. If you are interested in having your little one meet characters, opportunities abound to meet characters such as Mickey Mouse, Tinker Bell, and so many more! Throughout the Magic Kingdom, you will find attractions and experiences that will be wonderful for your toddler.
I do also recommend that you take a look at the
Walt Disney World planning video online. By doing so, you can see all four theme parks - not only Magic Kingdom, but also Epcot, Disney's Hollywood Studios, and Disney's Animal Kingdom Park, to see if there is another park that you think your little one will particularly enjoy.
No matter which Walt Disney World theme park you decide to visit, do take advantage of the
Baby Care Centers. There is a Baby Care Center in each theme park. These are a great place to change or feed your little one, or simply to take a quiet break away from the hustle and bustle of the theme park.
I hope that these thoughts are helpful for you, Alicia! Have a wonderful time planning your magical vacation, and please do let us know if you have any further questions.