Question: what documents do you need when you sign up for social security?
Answer: Proof of the child's birth. Original U.S. birth certificate, or Original U.S. Consular Report of Birth Abroad. ... 
Proof of the child's U.S. Citizenship. Original U.S. birth certificate, ... 
Proof of the child's identity. ... 
Proof of the identity of the parent signing the application.