You need proof of citizenship.
What happens if I have not already established my child's U.S. citizenship?
You will need to see proof of citizenship and we can only accept certain documents which include U.S. birth certificate or U.S. passport.
I'd like to know if you consider the U.S birth certificate of  my child to prove their citizenship?
Yes, that is a valid form you must submit as long as it shows their birth before age 5.
What happens if I can't find their U.S. state issued birth certificate?
If you don't have this in your possession will need to see other documentation such as the child's passport to prove their age.
Can I use a birth certificate as proof of identity for my child?
No, social security needs more than a date of birth to verify their identity.
What exceptions are made for verifying birth records to obtain social security for my child?