I do not believe you need to send a copy of your return unless you were penalized for not having health insurance for him ( on your return because he is your dependent). Just follow the instructions on form W-7-->
here are the instructions for form W-7 --- <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-pdf/iw7.pdf">https://www.irs.gov/pub/irs-pdf/iw7.pdf</a>
