I ate like a horse when ebf, was back to pre-pg weight in 12wks and am somehow now a stone lighter than that (dd 14m and still bfing)
it does take different people different ways though - your mileage may vary
Use your common sense - eat when you;re hungry but don't eat crap ANd remember a lot of the time you;re hungry because you;re so tired - if you;re awake an extra 5h a day you need an extra meal to fuel it, iyswim.
Listen to your body. You need more calories when BF than when pregnant!
Like MrsBadger I lost weight pretty quickly with little to no exercise and just eating what I wanted.
ATM I weigh about half a stone less than I did pre-pregnancy and I have done no dieting or exercise aside from walking with DS since he was born (he's about 10.5months and I'm still BF). OK, I'm pretty flabby but that's not going to change unless I hit the gym!
Don't worry about it, just try not to eat too much junk.