Well, in fact, it is. If your child is over 12, he must come to the office in person, so he can go through an interview. Plus, we'll verify if a SSN hasn't been issued to him / her before.
Do i need to present something in that case?
Yes. You'll need to present a proof of your identity, with an non expired document.
So just to be sure, you're open to accept other documents, do you?