Hi Kim!
I'm a huge advocate for giving infants/toddlers/preschoolers the opportunity to experience Walt Disney World. Not only can they have some amazing sensory experiences, but also you as a parent will walk away with so many wonderful memories.
With respect to your time in the Magic Kingdom and Disney's Animal Kingdom, my advice is to avoid a regimented schedule. At that age, children are very transparent with their emotions. So, if you see your child having a joyous reaction to something you encounter in the theme parks, a loose schedule will allow for plenty of time to savor those spontaneous experiences. (The photos I took from those spontaneous experiences with my children are my favorite photos of all!)
With respect to actual attractions, both of my children never had a problem with any of the attractions we took them on. If you have questions or concerns about any of the show elements used in a particular attraction (e.g. light levels, loud sounds, etc.), you can always ask one of the cast members stationed outside of the attraction for a heads-up on what to expect.
As far as eating goes, there’s only one restaurant in Walt Disney World that I wouldn't recommend bringing young children to - Victoria & Albert's in Disney's Grand Floridian Resort & Spa. That being said, I wouldn't shy away from any other restaurant that you and your family would like to experience.
Here's a little tip from your buddy Derek:
When booking dining reservations, snag the earliest seatings so you can minimize wait times and beat the rush.
I hope that helps to get the party started. My boss Mickey Mouse likes me to keep a reasonable length to each message, but if you write me back, I'd love to share more tips!
Best regards,
Derek