For my taxes they only needed copies but make sure when you make the copies that you make a copy of the official seal on it, also you will need copies of any adoption subsidy agreement you may have, if you did domestic infant adoption thru birth mom, then this prob doesn't affect you, also you will need DOB and SS number of the child, and of course anything else you include in your regular taxes,
Re: adoption tax credit - copies of doc OK?
I was just looking online to see what we needed for this year's taxes and came across this:
https://www.irs.gov/individuals/article/0,,id=96452,00.html#QA10
It says that you should not send originals to them. Only copies.