My own interpretation of this is a little different, i think Daniel has a momentary realisation that sending his child away was the wrong thing to do because it reflects badly on him in the eyes of others. From the time he adopts HW he uses the child to get deals with landowners impressed that he is a 'family man'. HW is an asset and a means to get what he wants, i think in this scene he realises he shouldnt have sent him away for that reason. Daniels driving force is his need for power, when the time comes later he casts HW away again when he has achieved what he needs and has no further need of him.When Daniel has to say that he abandoned his child the third time there's so much emotion when he says "I'VE ABANDONED MY CHILD", that its real, its not him trying to fake his way through the baptism but for a brief moment you see his actual self.