I did not lose a pound breastfeeding. Any time I cut calories, my supply would tank. I eventually gained back 10-15 pounds by the time I weaned my daughter around 15 months. It was very frustrating to say the least.
At around 6 months pp, I decided to focus on exercise. I completed C25K while I was nursing, took up boot camp, started riding my bike to work again. I got much more fit, even if the scale didn't agree. And I ended up dropping 10 pounds almost immediately after weaning.
I think some of us hold on to weight during that post partum time. I had a coworker melt away bf'ing and it's hard not to compare. In the end, I weaned earlier than I would have liked because the standstill was too much for me to handle.