I had the same types of concerns while pregnant. I have a wrist disease that is extremely painful, and in the last surgery had my wrist fused and a weight lifting limit of 3kgs for life. I thought, 3kgs?? How am I ever going to lift a baby?

My bub was 4.8kgs at birth and I was terrified I wouldn't be able to carry him around, but 4 months on we are doing just fine! I rely on the pram a lot while we're out, sit while holding him as often as I can and lay him beside me for cuddles. Even when my wrists are killing me and I can't pick up a coffee mug, I still manage to hold him without problem! As the other posters have said, you will find ways to do it! :-)