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: Hello, I want information about the original documents required to get a social security card for an adopted foreign-born child.

assistant: first, you need to prove your child's citizenship.

assistant: Do you have your child's foreign birth certificate?. If not, there are other options.

user: I don't have the certificate, please tell me about the other options.

assistant: You could use your child's passport or a document given by the DHS as evidence of your child's age.

user: and for me, what documents can I use as proof of identity?

assistant: You could use a state-issued non-driver ID card or a U.S. driver's license.

user: isn't my passport enough to prove my citizenship and my identity?

assistant: Yes, we actually can use one document for two purposes like in the passport case to prove both your identity and citizenship, but you need to provide at least two separate documents.

user: now, my kid has lived in the US for quite some time now. Is there anything else that I need to do?

assistant: You have to provide records of your child's school activities or tax records that show that your child was never assigned a social security number.

user: and, apart from the passport, what other documents can be used as my child's proof of identity?

assistant: you can use the adoption decree or a state-issued non-driver's ID card, among other accepted documents.

user: Does the kid have to be present during the interview?

assistant: If your child is 12 or older then yes, the present of the child is required.