I bf almost 5 mths la! still have 6 lbs to lose. Although i have a full time maid to helpout with babysitting and eat a lot (more than i need, ie. 2 full bowl of rice in each meal), i can keep lose around half lbs a week with no exercises since i have no junk food.
If you get bigger during bf period, it means that you eat too much. want to lose weight?? keep your diet with no salt and sugar. also, atmost 6-8 tea spoon of oil a day only. that means no sausage, ham, ribs, fries, chips.