in that case we will consider other documents such as your child's passport or a document issued by the DHS Department of Homeland Security as evidence of your child's age.
Also, for what kind of original documents do  I require?. And what will happens if I haven't yet developed my citizenship?
You can give as proof of your U.S. citizenship documents like your U.S. birth certificate or your U.S. passport.
What if I don't have some of the required documents?