No, you do not amend your return. Your son should amend his return, but you do not have to wait for him to do so. You cannot e-file a return now that claims him as your dependent, though. His SSN is already in the system, so now you have to print, sign, and mail your return claiming him as a dependent.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
