Hi Jeremy,
Thanks for your kind words. We love sharing using our experiences to help other guests plan their magical
Walt Disney World vacations.
You won't need any sort of ticket or pass for your youngest child. He or she will simply enter with you into the park and into any rides and attractions that are height-appropriate. I've been visiting Walt Disney World with my children since they were babies, and though I always carried a card-sized copy of their birth certificates with me, I never was asked to show proof of age. In fact, I don't think I recall anyone asking their ages unless they were wearing a "Happy Birthday" button.
Since you have younger children, Jeremy, you might find some helpful information in the guide for visiting Walt Disney World with
preschoolers and little ones. And please take advantage of the
Baby Care Centers if you need a place to change diapers or tend to other needs for your young one.
Thanks again for stopping by the Disney Parks Moms Panel. Please let us know if we can answer any other questions as you make your plans. Enjoy!
Wilma