Disney World has height requirements for several attractions, and it can be frustrating if you have a child who is right on the edge of that height because you want to be able to do as much as possible during your trip.
However, the requirements are there for safety reasons and should not be fudged. Just make sure you're prepared ahead of time and know which attractions have requirements so you can plan accordingly.
How will my child's height be checked?
Unlike some places, there isn't one centralized location where you take your child to get measured and you don't get a bracelet or any other identifier to let people know your child is tall enough for the rides.
Generally speaking, at all of the attractions where there is a height requirement Cast Members will check your child's height twice: once when you enter the line and then again as you get closer to where you board.
Your child has to pass both of those inspection points in order to be allowed to board the attraction.
Just like adults, from day to day your child's height might change ever so slightly. So, it isn't unusual to have instances where somebody was tall enough to ride an attraction one day but not the next. If your child is one of those who is just barely tall enough it might not be a bad idea to prepare them just in case they fall a little short.
Check out our overview of all Disney World attractions with height requirements for more info.