I already filed my taxes and claimed my son as a dependent but its only showing me my state and fedural how do i see what im getting back for my son?

There is no set amount that you get back for claiming a child. The benefit of claiming the child, if any,  is already included in what Turbotax says you are getting back for state and federal. There is no separate listing of a "per child" refund because there is no such thing.