In my opinion, I dont' think you should decrease your calories anymore. If you are nursing that is pulling a lot of calories that you are not taking into consideration. I think your body is in starvation mode and holding onto all the food you are eating. If you want to try to lower your calories, go ahead but you may want to play around with it and try to up them for a week or so and see if that helps first. I think nursing is supposed to use 500 calories a day (could be wrong about that but that's the number that comes to mind) so you are only getting 800-1000 calories anyway (and that's before exercise). You should NEVER go below 1200 or your body holds onto every bite you eat because it thinks it is starving.
Just my opinion, Good luck!
December 2005-lowest weight of 148.5
Start weight Ocotber 2010-186.6
Current weight 178.5
GW-140 April 2011