If this was a newly issued SS# then you can claim the child as a dependent however even though the program will give you the child related credits expect the IRS to disallow them due to the new tax law changes ... the program should ask you when the SS# was issued but it doesn't ... maybe something they will add in the future.
The Protecting Americans from Tax Hikes or PATH Act made several changes to the tax law, including preventing retroactive claims of the EITC and CTC by amending a return or filing an original return for any earlier year in which the individual or anyone listed on the return did not have a SSN valid for employment. You can't claim EITC or CTC unless the Social Security number for you, your spouse (if married filing a joint return) or a qualifying child is issued before the due date of the return including any valid extensions.
http://www.thetaxadviser.com/newsletters/2016/jan/congress-makes-changes-to-popular-tax-credits.html
