My three month old is coming off a growth spurt so for the past couple weeks I've been uncomfortably full unless I pump. So I've been pumping a couple times each day and getting around five ounces each time. I give the milk to my 20 month old who will no longer latch in a sippy cup. The baby has never had a bottle and I don't anticipate her ever needing one (my other kids never had one either) and we're moving soon so freezing it isn't an option so I don't mind just giving it to the toddler. I gained a lot of weight between my last two pregnancies (which I lost after the first two) and would really like to get back into the clothes I was wearing a couple years ago and feel better about myself - I also really want more than two pairs of pants to wear!
My question is:
Has anyone used breastfeeding to lose weight? Is it a bad idea to do so because it will take extra vitamins and minerals from my body (especially calcium though I take a calcium supplement, drink milk, and take a vitamin)? I did the math and if I pump 10 oz per day extra that's 200 calories per day = 1400 per week = nearly two extra pounds lost per month. Is this nuts?