Unfortunately, you won’t get any benefits for amending a tax return to add the child Later in your situation. You can only claim a dependent if they have an SSN before the filing deadline of a timely filed return. (A timely filed return means a return that was filed before the July 15 deadline, or was filed before the September 15 deadline if you were out of the country and use the two month automatic extension, or was filed by October 15 if you had previously gotten the October extension approved in the usual way.)
Can you obtain the Social Security number by visiting a US consulate or embassy?
