From what you are telling me, there is a significant weight gain even if your lo is on bm. I assume that your bm is enough if there is a weight gain. Do you want to have your lo exclusively breastfeed from now on? You may do so by trying to increase your milk supply. Perhaps you can do the pumping every 3 hours or just do direct latching. The more you give, the better your supply will be. Also, do continue to monitor his weight against your baby book. If he is within his normal curve without a dramatic decrease in weight then he should be fine :-)
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