Hi Andrew,
Thanks for visiting the Disney Parks Moms Panel with your question.
One of the great things about a Walt Disney World vacation is that all members of the family -- from the youngest to the most senior -- can take part in much of the fun. My younger daughter made her first Disney visit at 2 1/2 months old, and while she certainly couldn't zoom on Space Mountain or drop on the Tower of Terror, she was able to accompany us on many of the iconic attractions.
As long as there isn't a listed height requirement, your little one can ride along with you. Some of the baby-friendly attractions at Magic Kingdom include Dumbo, it's a small world, Jungle Cruise, Many Adventures of Winnie the Pooh, Pirates of the Caribbean, Under the Sea -- Journey of the Little Mermaid, Peter Pan's Flight, Buzz Lightyear's Space Ranger Spin and Haunted Mansion.
At Epcot, you can enjoy Living with the Land, Ellen's Energy Adventure, Spaceship Earth, The Seas with Nemo & Friends, Gran Fiesta Tour and the shows and exhibits of the World Showcase.
At Hollywood Studios and at Animal Kingdom, it's easier to name the attractions that DO have height restrictions. Only Expedition Everest, Dinosaur, Primeval Whirl and Kali River Rapids at Animal Kingdom and Rock 'n' Roller Coaster, Twilight Zone Tower of Terror and Star Tours at Hollywood Studios would be out of reach.
You will find facilities throughout the parks also are baby-friendly, with chancing stations in every restroom and
Baby Care Centers in each park where you can cool off, nurse, change, feed and rock your little ones.
I hope that information is useful as you plan your visit with the smallest member of your family. Please let me or one of my Moms Panel colleagues know if we can offer any other details to assist. Enjoy!
Wilma