I am also breastfeeding. The first month I didn't lose a thing, but I gained a lot of muscle. I also had a hard time losing before baby was a year old, no matter what I did. He's now 14 months and I'm down 7 lb in 2 months. I've been trying for 7 months. I've restricted my calories to 1800, and I go to a trainer twice a week and run twice. My boy has also cut down significantly on the amount he nurses, so that may help.
You are definitely not alone! I tried to take on the idea that I wanted to get healthy, not lose weight. That helped me get through the first little while.