smahoney is right. IF you have a raised seal on your birth certificate (some states like mine do not) then it should be the seal of the state usually at the bottom that does look kind of like a notary stamp. If it isnt raised I would make sure that it at the very least is not a hospital birth record but a real birth certificate and it is certified. They now dont look for raised seals as much as they do a certified copy since alot of states dont raise seals (like mine)
Have a great time!
Heidi