If they are not an American citizen Social Security will ask to see a current DHS document . Such as a I-551 Permanent Resident Card
Do I need to take my kid down their when I go or just the documents?
If they are age 12 or older and requesting an original Social Security number then they  must appear in person for an interview. We will ask for evidence to show that your child does not have a Social Security number .
Okay, and this will also help me with getting their taxpayer ID number?