I not only hold onto weight, but actually gain while bfing. I don't eat any differently or any more. My 4th lo is 11 monthes old and I am still 15lbs heavier then a few days after his birth. I was determined not to let it happen again for the fourth time, so when he was 4 weeks old I started working out. I worked out for about 6 weeks, just brisk walking and weight training... I gained 10lbs. I was so frusterated that I quit for a month. I started back up at 4 monthes pp, I went hard core and was doing weights 4x a week, 45 mins of cardio 5-6x a week, 50 min pilates class 2x a week...I gained 10lbs more. After about 4 monthes of that I was exhausted (I had to get up 2 hrs before everyone to get to the gym, then get home, shower, and get 4 kids dressed and ready to drive ODD to school, and of course at night I still went to bed later then everyone with trying to get dinner made, lunches packed, homework done, baths, and bedtime!) I also have low thyroid, so that's part of my problem. I quit working out when he was 8 monthes old and quit dieting, I have lost 5lbs since then and get 2 extra hrs of sleep everynight! I'm going to just try to eat reasonably, go for nice walks and bike rides with my kids and not stress about the weight. When it starts coming off on it's own, then I will go back to my hard core workout.