Well, yeah, is perfectly possible for you to present documents. In fact, you'll need documents to prove you he /she is a U.S citizen, such as Certification of Report of Birht or child's U.S passport.
Do yo have any of these documents or not?
Yeah, in fact i have them, thank god. I took my previsions. But in any case i wouldn't have them, you would accept some other document?
Sure, there's an option if that's the case. We can take in account other documents such as your child's passport, so we can verify your child's age. Of course, that document must come from DHS.