I felt a little like this after DD birth but I think that was more from the shock of having such a fast birth and then having to be stitched and fiddled with. Then when we came home with her it was still "weird" and I was almost scared of her because I had this notion in my head that she would just die. Plus the problems we had BF etc.
I loved her of course but I just felt like "yep this is my baby" itms??
I personally DON'T feel the injection for the release of the placenta had anything to do with it, just a fast labour and birth, BF problems and my own fears that she was going to be taken away from me.
It did take a while to really FEEL that lovey dovey overwhelming mother stuff, so really I believe it has to do with a combination of birth and maybe past experiences (where applicable).
:dunno:
Nae x x