I have been breastfeeding my baby for 9 months already. at the begining, it took me almost 1-2 months to get to 100% bf, however, once you passed this stage, you will really enjoy the process of bf. I'm a full time working mum.since we spend our whole day at work, we don't really get to play with our babies till late night. when I spoke to other mummies whose babies on forumula, I feel that I have closer bonding with her.
as for the weight, I can tell you that it's not really a big concern. as long as she is within the curve, I think that's fine. once the baby moving around, you'll find that baby within normal curve can move and do most of the things than those overweight.
hope this will give you more heads up.