My guess is you are eating too little. Nursing and producing breast milk actually burns a lot of calories and I doubt the BodyMedia algorithms have any way to account for that. So while your BodyMedia may be telling you that you're burning 2300 calories a day, for instance, you may actually be burning more like 2600. So your real deficit is larger than what you are seeing on your Activity Manager. If your deficit is too high, your body will compensate by slowing your metabolism.
If I were you, I would do a little research on exactly how many extra calories you may be burning by nursing and then factor that into your calculations about how much you should be eating.
| current weight: 202.2