I would suggest that for now, catch up on your sleep and continue to breastfeed or pump. It is a well known fact that lack of sleep causes weight gain and sleeping burns calories! Continue to breastfeed or pump because your body burns 20 calories to produce 1 ounce of milk. So if your baby drinks 30 ounces a day, you burn 600 calories a day without exercising! Improve on your diet too. Try taking oats and brown rice to regulate your sugar intake so that you don't feel hungry easily, and oats help to boost your milk supply. Lastly, do not starve because your milk supply will drop.
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