Help I'm stuck!

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I had my daughter about 9 months ago now. I dropped about 15 lbs in the first 3 months, but for the last 6 months I've been stuck! I don't binge eat, I'm not a big snacker, and I eat moderate portions. I walk several times a week, and am training for a job that requires me to be physically active. But none of this seems to be getting me moving on weight loss. Any suggestions about how I can break this barrier and start losing again?