Oh, a big to you Macca.

I was the same as you. Although in the first few days after the birth I thought I had really bonded with my little girl, but as the baby blues and sleep deprevation kicked in I found myself really emotionally distanced from her.
like the others have said it's all to do with hormones being out of wack but for me dealing with the grief of no birth experience (I was knocked out for my caesar) also played a part.

The love for your bub WILL grow. Please try not to beat yourself up about the way you feel as it is sooo common and trust me, it WILL get better.

If you are still not feeling right in a few weeks please make sure you seek help as it could be PND. Unfortunately that's what mine turned into but since I acknowledged the fact that I had PND and I sought help I've never looked back and never felt better.

Take care