Why am I gaining weight while breastfeeding and exercising?

mommy of 3

New member
I have a 7 month old and have started exercising again. I do cardio about 4 times per week. I have noticed that I have gained about 3 pounds in the last week. I am only trying to lose a few pounds, I am mainly exercising so I can get toned and gain some energy. I am breastfeeding, so I am burning plenty there. Why am I gaining weight. It can't be muscle this quickly, and I am not doing any weight training. Am I not be eating enough, and my body is storing whatever it can? I am not dieting, but I am a fairly small person and I don't eat a lot. Why is this happening?
 
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