Hi, Val!
What fun you are about to have, traveling to Walt Disney World with two little ones in tow! On my first visit to WDW, I had a 5-month old and a 3-year old with me, and it really wasn't tough to enjoy the parks.
One of my favorite spots for information for Guests with
Little Ones at Disney Theme Parks is on Disney's website. There, you'll find information on Disney's Rider Switch program, which enables both adults to enjoy attractions which are too much for little ones,
without having to wait in line twice. Love it!
Plus, all of the attractions listed as appropriate for Guests of any age or those without height restrictions will be just fine for both children. We used a front-facing baby carrier and took our little guy on all of these rides with us; no problem.
Attractions you'll all be able to enjoy include all of those listed on that link above, as well as a few others. In Magic Kingdom, our whole family (baby in front-facing infant carrier) enjoyed Buzz Lightyear's Space Ranger Spin, Peter Pan's Flight, The Many Adventures of Winnie the Pooh, Pirates of the Caribbean and The Jungle Cruise. Add in New Fantasyland attractions, and you've got days of adventure for one and all. Epcot's Living with the Land is great for all, as is Disney's Hollywood Studios' Voyage of the Little Mermaid and Toy Story Mania! Animal Kingdom's Kilimanjaro Safaris is a great ride for your toddler, it gets a bit bumpy here and there, so you may not want the infant with you on that attraction.
Of course, all of the shows are appropriate for everyone, so be sure to build time into your daily schedule to enjoy them as well.
Be sure, too, to utilize the Baby Care Centers, located near First Aid at all of the four main parks. Wonderful!
Send more questions as you think of them, Val; we love to help!