I'm curious about the birth certificate idea that some people posed, my youngest dd is 2 1/2 won't be 3 til next March, but she is really, really tall for her age. She's 39 1/2 inches and is taller than some 4 year olds I know. I thought about bringing her birth certificate but then wondered what that really proves? I mean it isn't like they have a picture or anything on them so how do they even know that the birth certificate your showing is actually for that child? Am I missing something?
Anyway OP, I took my oldest DD just before her 3rd bday a few years ago and never had any issues at all and she was pretty tall for her age too.