Andy, sorry to here that you have worries about bonding.
to be honest with you, with my son it was only when he got to about three months that I started to get a really strong attachment to him and for him to me. its about this stage that you start to get a reaction from them like a smile or them recognising you as you come into the room, that they dont do for aother people.
As for him recognising mums voice, this is understandable, he has already had 9 months of her voice every time she has spoken while he has been in her tummy. It will take time him to recognise yours in the same way.
If it is any consilation, it gets better and better to around two, where there is a bit of a blip, and they start to push the boundaries and express their own will, this is wher i am with my boy at the momment, but its not to bad.
Chin up....

it will come, just takes time.