I can not gety sons social security number because the social security administration is requiring me to send in original paperwork by mail. What do I do?

To obtain a SSN for your son, you will have to provide the Social Security Administration with original documents (e.g. birth certificate). You can either mail them or take them to the nearest Social Security Office. You will not be able to claim your son as a dependent on a tax return without a SSN.

Application for a Social Security Card