BF and weight loss?

[Madigan]

How long do you have to bf for before you start losing weight?
Just wondering whether it should be immediate (obviously so long as you are not existing on chocolate/biscuits) or more long term
I know I am ridiculous to be worrying about this when DS only 4 weeks old, but I just hate being so fat ............ have 2 stone to lose ...............

DS2 is 11 weeks and I still have 8lb to go. Was back in my big jeans by 3 weeks but the lovehandles are revolting and as of today I'm being much more careful about what I eat in a vague attempt to shift that last bit.