Hi Arthur,
Your trip will be here before you know it! I love that you are planning ahead and researching height requirements.
You can find a list of the attractions with height requirements by visiting the
Traveling with Little Ones section on the Disney World Website. There you will find a PDF file on the right side of that page that lists attractions at all four of the theme parks that have height requirements.
Keep in mind that just because an attraction doesn't have a height requirement, doesn't mean that every child should ride it. Haunted Mansion is a great example of this - there is no height requirement but its dark and once you're on, there is no great way to get off of this 7 minute and 30 second ride.
If there are any attractions where your kid(s) don't meet a height requirement, look for other attractions to get them excited about. This is a great way to prepare kids before they go so they are not disappointed when you reach the parks and hopefully avoid any meltdowns.
Let me know if you have any questions about any specific attractions - I'm super happy to assist you. Wishing you many magical memories :-) Allison