Having trouble gaining and/or losing weight

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I have been trying to lose weight by trying different things since I had my baby girl in October. I try to stay lightly to moderately active while I am awake and try to avoid a sedentary lifestyle. However, I have always had trouble gaining or losing weight since I was in middle school. It was wonderful before I was pregnant but now I can't seem to get this baby weight to disappear. The only good thing about it is that I'm not getting any heavier. Any advice?