Hi Rodger,
Thank you so much for visiting the Disney Parks Moms Panel with your question. I am happy to help you to plan your day at
Magic Kingdom!
There is a great
Disney Parks Blog post that lists height requirements for attractions at Magic Kingdom. This list includes the heights that a guest must be to experience the attractions with height requirements. There is also a link to height requirements for attractions at Epcot, Disney's Hollywood Studios, and Disney's Animal Kingdom.
Another way to determine if an attraction has a height requirement is to visit the
attractions at Magic Kingdom page. By scanning down this page, you can see which attractions have height requirements. I see, with minimum height requirements in parentheses, The Barnstormer (35 inches), Big Thunder Mountain Railroad (40 inches), Seven Dwarfs Mine Train (38 inches), Space Mountain (44 inches), Splash Mountain (40 inches), Stitch's Great Escape (40 inches), and Tomorrowland Speedway (32 inches).
I hope that this information is helpful for you, Rodger! Please do let us know if you have any further questions.