Hi Crystal!
Wow - I bet that little boy's feet will never touch the ground! With grandparents, parents and aunts, who needs Mickey Mouse??? Just kidding! Without a doubt, I suggest that you spend your days in the Magic Kingdom. While Animal Kingdom is awesome, Magic Kingdom is truly the most magical place on Earth!
The official Disney World website has a special section dedicated completely to
traveling with little ones. It offers suggestions on everything from what to pack, to height restrictions on attractions. As a mother of three boys, of course I have some favorites to recommend! If he is anything like my little men, he will LOVE Buzz Lightyear's Space Ranger Spin, The Many Adventures of Winnie the Pooh, Peter Pan, Dumbo, It's a Small World and all of Mickey's Toontown Fair. If he is a little adventurous, he may even love Pirates of the Caribbean and Tom Sawyer's Island. Mickey's PhilharMagic is an awesome "4-D" movie that I'm sure that he will adore - I love watching little ones reach out at the 3-D illusions! I think that you will be pleasantly surprised to learn that he will be able to ride on nearly every attraction at this park.
If you haven't already, I highly recommend ordering the free planning DVD that can be found on the above mentioned website. Our boys love watching it over and over!
Much pixie dust,
Jackie S.