Daddy issues?

This is my fourth baby(I know its a lot) but my first with my new husband. We have all 3 of my children all the time with no help or support from my ex. I know it takes a lot to raise them and get everything they need. I am a stay at home mom so he is the only source of income. I love my husband and greatly appreciate him doing so much for us. My problem is he doesn't act excited about our baby! When I ask him about it he says he is but he's just worried about the cost of taking care of it. I understand that but we all ready decided to use our tax money to get the things we need for the baby since I'm not due until the end of March. So shouldn't that have taken the stress off or atleast helped? I tried to keep him involved but it isn't working. He hasn't come to any of my appointments and when I asked if he was coming when I find out the sex he said he'd try! I just don't understand because I was with him during my pregnancy to my last baby and he seemed more excited then than he does now and this one is really his! It is all just shocking to me and I don't know what to think about it. Any advice? Or even opinions anything is welcome. Thanks! :)