I agree, there is exceptions, but in general BFing rocks for weight loss. I am 5'6, and weigh 123lbs. I do 5 minutes of abs a day, and this is my story. I am 35 yrs old, and have 3 kids under 5. Kitty is 6 mos old. This is my pre-preg and pre-cycling weight.
I only have ever semi-dieted since Kitty was born. I still ate a Blizzard at least twice a week. I ate 3 meals a day. Once a week, my meal was nachos and cheese. The semi part was that I tried to reduce snacking. Which did not work. There would be times in the day that I would be feeling like I would fall over, my sugar would dip, and I was ravenous. I eat a high protein breakfast, which helps with sugar highs and lows as well.
I discovered this, after 3 kids... I gain about 30lbs per pregnancy. I do eat normally through my pregs, and walk or swim daily, which I do even when not preg. I do not use pregnancy as an excuse to gain 60lbs, but I eat ice cream daily.
Post partum, after ds1, the weight fell off. I was in my jeans in 2 weeks. Ds2, after 2 months, I had 5 lbs to lose still. I dieted, and the weight fell off. At 4 mos, I was no longer dieting, but the weight kept peeling off, so I went underweight. Now, after #3, I did really not a whole lot. At 2months post partum, I was angry I was still 10lbs up. I tried running, and gave up after 2 wks, but kept walking. At 4 mos, without doing a single solitary thing different, the weight started just coming off. And has now settled, by 6 mos, at my pre-preg weight, or possibly a bit below, as I bought a new scale since cycling. I am below the weight I gained to cycle with on my 2nd cycle.
So, my theory is, that EBF, you can achieve your pre preg size, and the weight for me flies off at the 4mos mark. And still eat cake. But I could just be lucky