Hi Audrey, it might help to go to the attraction page on the Disney website, click
HERE, to see more explanations of what rides have height restrictions and which are best suited for certain age groups. When you reach the attraction page please look at the bottom left where you will see several categories such as height, recommended ages, type, and location. Click on these sub categories and check off the details that pertain to you and it will filter into a good list of attractions that are suitable.
They are very strict on the height restrictions for all attractions. My grandson is 40" and although several rides have that as a minimum height he was allowed on two but not on a third. It was easier not to argue as we know we will be back to Disney many, many more times and he will continue to grow so it isn't an issue.
If you have a specific question about a specific attraction once you have read through this information then please don't hesitate to write us back so we can help you with your planning!