Tay N Evie-
It's my understanding that there is such a place. As I've heard on numerous posts of this sort before you take your child to city hall first thing in the morning, they can measure them officially there and give them just such a wristband. I agree that that is a very frustrating situation and if that is indeed the case, I think that would be a great way to hopefully avoid just such a situation in the future.
In response to some of the other stuff...I don't want to get flamed again about this. I'm not trying to start a fight. It just seems like we get posts like the OP left *all* the time on here and it's really really frustrating. I know you want your kids to be able to enjoy all the magic of Disney rides, but as a previous poster noted, they aren't trying to ruin your or your child's day. They just want to keep you and your family safe. It's not a matter of age, or scariness...it's a matter of safety from restraints and again, as a previous poster noted, just adding poufy hair and thick shoes doesn't actually make your child any taller, hence they aren't any safer. The rules are there and enforced harshly for a reason....nonethless, I wish everyone a wonderful (and safe!) trip.