One of my mates married her childhood sweetheart (who personally I think is a bit of a tosser, but there you go), and proceeded to get pregnant. He was in total denial for the whole pregnancy, did not even refer to the baby, pretended she wasn't pregnant at all times, etc etc.
However a few days before the birth he took himself off and bought a Brio train set as a present for the baby. It had obviously taken 9 months for him to process the information man-style, but once he was ready, he was ready. They went on to have another and they have been married in total for about 12 years now.
This also happened with some neighbours of ours as well. Total denial until the actual birth, then it was found the baby had undiagnosed Down's and a bad heart condition, and died after a couple of days (this was about 15 years ago before such good scanning techniques). He proved to be solid as a rock after that and they went on to have other children as well.
I think the best thing to do with a man processing Big Information is to leave him alone in his little cave to work through it, and get on with trying to be busy and happy yourself. Eventually said man will most likely emerge into the daylight and start being nice and supportive from that point on.