[cubsblue]

The TSA site states, and all airlines follow the same practice as well, that ID for those under 16 is not needed. I would not risk loosing such piece of ID as a birth certificate for something as unneeded. It would only be needed if the child is under two and you are not paying for a seat. They do check that sometimes and I have seen people without them charged. The cost is refunded if you fax the proper documentation later. ID's for those under 16 just hold up the lines which is a pet peeve of mine.