A.R.
My advice would be to give him some time. Even though it may not seem normal to you, it can take a new dad a bit longer to really bond with a new baby. Especially if it was a surprise. My hubby doesn't have any major issues in the nurture area and he took a solid 6 mos with each of our 3 children to really embrace them(or to notice them for that matter!). He is the greatest dad from then on. A new baby is a big deal for everyone as well as for a marriage. Pressuring him could cause the opposite of what you want. So, try a little patience and once your little one is a little more like a person, I would be willing to bet he won't be able to help himself. Best of Luck!
A.