Original Card for a Foreign Born U.S. Citizen Adopted Child 
Information You must present original documents or copies certified by the agency that issued them. We cannot accept photocopies or notarized copies. All documents must be current not expired. We cannot accept a receipt showing you applied for the document. Adoption In some cases , we can assign your adopted child a number before the adoption is complete , but you may want to wait. Then , you can apply for the number using your child's new name. If you want to claim your child for tax purposes while the adoption is still pending , contact the Internal Revenue Service for Form W-7A, Application for Taxpayer Identification Number for Pending U.S. Adoptions. For more information, see Social Security Numbers For Children (Publication No. 05-10023). 

What original documents do I need? 
Citizenship We can accept only certain documents as proof of U.S. citizenship. These include a U.S. passport, Certificate of Naturalization N-550/N-570 or Certificate of Citizenship N-560/N-561. Foreign - born adopted children residing permanently in the United States may automatically acquire U.S. citizenship when they meet certain requirements. We may accept the following as evidence of U.S. citizenship : Certificate of Citizenship N-560/N-561 ; Certificate of Naturalization N-550/N-570 ; Machine Readable Immigrant Visa MRIV showing a category code of IR3 or IH3 ; or U.S. passport. Age You must present your child's foreign birth certificate if you have it or can get it within 10 days. If not , we will consider other documents such as your child's passport or a document issued by the Department of Homeland Security DHS as evidence of your child's age. Anyone age 12 or older requesting an original Social Security number must appear in person for an interview. We will ask for evidence to show that your child does not have a Social Security number. Here are examples of documents you can use to prove a Social Security number was 

user: Yeah, hi. i need some info about an SSN card for an Adopted Child, please?

assistant: Sure, no problem. For that, you need to present some original document certified by the agency that issued them.

assistant: I must ask, do you want to claim your child for tax purposes?

user: Yeah, that's exactly what i want to do.

assistant: Perfect. In that case, you must contact the U.S IRS for you to get Form W-7A or Application for Taxpayer Identification Number for Pending U.S Adoptions.

user: Great, that's just great, thanks. Where can i go if i'm in need for more information?

assistant: You can look Publication Nº 05-10023, Social Security Numbers for Children, for more information.

user: Ok. Say, just happened to cross my mind, Can my adopted child have a SSN number before its adoption ends?

assistant: Well, that would be a yes. There is some cases that we can assign a number to the child before its adoption process ends, but we recommend to wait instead, cause in that way you can get a SSN with your child's new name.

user: That sounds reasonable. Ok, another question, please. What can i do in case i don't have a specific document at hand?

assistant: If you have that scenario, then you'll need to show us other documents. Of course, these documents will need to be unexpired, and showing your name, date of birth or age and recent photograph, as seen on a Employee identification card, for example.