Get your taxes done using TurboTax

This may not be the issue you are asking about, but back to the dependent situation for a second, just to confirm that you did indicate the whole year.   You said the baby was born in May and lived with you "all year until now."  So by that did you mean that you indicated in the program "the whole year", right?
  
Also see this FAQ about indicating the newborn baby lived with you "the whole year",  but the years are wrong.  Please ignore the mention of 2016 in the FAQ.  I will tell TurboTax to update the FAQ to 2017.

<a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/3650684-can-i-claim-a-newborn-baby">https://ttlc.intuit.com/questi...>