Hi Tasha!
Thank you for bringing your question to the Disney Parks Moms Panel. I've actually seen online where pediatricians offices will have a Disneyland Resort attraction poster next to their measurement chart because reaching those certain milestones can be a big deal for Disney fans!
If you visit the attractions page you can filter out by whether an attraction is at
Disneyland Park or
Disney California Adventure Park, as well as the minimum height requirement. For example, say your mouseketeer is currently 37" tall. You'd select the highest requirement they meet on the filter, in this case 35", and it will show you every attraction a kiddo 35" and above could ride. For the attractions that have no height requirement, you'll also see this as a filter option. The current milestones assigned to attraction requirements are 32", 35", 40", 42", 46" and 48" in height.
Please come back if you have any other questions before your quickly approaching visit!
-Lindsey