It is very hard for men in the first few months, there is often little they can do, esp if baby is breastfed, but whether breast or bottle fed, the baby has gone from being in your womb, to being an extension of you right now, it takes time realise the world around them, for now they rely on their mamas until they become aware. DH said, with DD, and certainly true this time round too that he is the fetcher and carrier for me, and that is how he helps in the first few months. He now accepts this but he found it hard with DD.
However, he, and carried on being involved, cuddling even if she cried, (just not for long before passing back!) changed her nappies, talked to her, read her stories, even though he felt he got little if anything at all back and made sure he supported me so i was able to do what I needed to do.
Now, she is 3.5 they are absolutely the best of friends, and they have the most immense bond you can imagine. She adores him and has done for a very very long time. I would say, and Dh would probably agree, that from about 6 months he became much more hands on, and the bond flourished quickly from then. With DS now aged 6wks, DS mainly nomnomnoms his ears, face, neck, and then cries when nothing happens, and he gets either passed to me for feeding or into the rocker!
Tell your DP he absolutrely not alone, but to keep on doing things with her, even if he gets nothing but cries in return. As it will start the foundations for the bond that will come. If he backs away, when the time comes for the bond to develop visibly, he will need to start that process from scratch. It is happening now, he just cannot see it yet.
He also needs to keep being involved to give you a break, so you can rest too