That's correct. If you didn't, then you need to provide a proof of the child's U.S citizenship. In that regard, we only accept certain documents in order to verify that, such as a U.S birth certificate or a U.S passport.
So, that documentation is something i must show to you if i hadn't done before.
That's correct. The procedure only apply if you didn't before.
By any case, you don't have the documentation?