Hi, Jess!
Welcome to the Disney Parks Moms Panel and thanks for your question. You’re going to have a pixie-dusted anniversary trip to Walt Disney World with your little ones!
There are lots of attractions even your youngest will be able to ride, especially in Magic Kingdom Park. If there’s no minimum height requirement posted at an attraction, all your kids can definitely ride it. I think you’ll be pleasantly surprised by just how much the whole family will be able to experience together! There are many attractions Guest of all ages can enjoy, like Dumbo the Flying Elephant, “it’s a small world,” Pirates of the Caribbean, Jungle Cruise, Peter Pan’s Flight, and The Many Adventures of Winnie the Pooh, just to name a handful.
Keep in mind that Guests with children who don’t meet the minimum height requirement may take turns experiencing attractions using the Rider Switch program. It allows an adult (and older children who are tall enough) to ride while another adult waits with younger children. You then "switch" so the second adult can enjoy the attraction without waiting all over again. The specific procedure can vary depending on the attraction, though, so it’s best to let a Cast Member at the beginning of the queue know you’d like to use Rider Switch and ask what steps you should follow.
I hope this helps, Jess, and that you have a wonderful vacation to the Walt Disney World Resort with your family! Please write back with any other questions you may have as you continue to plan.
Wishing you magic,
Courtney