I'm just wondering, do you work or are you home with your new baby all day? If you work it's less hours that you can spend creating that bond. I'm home all day w/ Sugar so she tends to hang out by me more than w/ my dh. When he gets home from work she's all over him for a while and then she comes back and lays by my side. I don't smother her w/ attention, for the most part she just wants to lay by my side. My dh is wonderful w/ her and she shows that she loves him, she's just with me more so it feels natural to her to come and lay by me. She does sleep between his feet though which he hates. He can't move all night because he'll squash her. In the past all of our animals have slept on my side of the bed so he's having a hard time adjusting to having to share his space. I don't mind that she sleeps on his side, I like to be able to toss & turn w/out worrying about her.
Just give your baby some time and it will all work out okay. Maybe just try to adjust your mindset a little to thinking of the dog as a "joint ownership" instead of a his & hers thing. I'm sure it loves both of you and as long as you show it love it will know where to come when it wants a belly rub. Good luck & keep giving that little one all your love.