How much pumped milk?

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Moms who feed bottles of breastmilk, how much did your baby drink at 1 month? My son is now 5 weeks and will finish a 4 ounce bottle (paced feeding) and still want to nurse afterwards. Is this normal? I have been avoiding making larger bottles as it seems like a lot. Does it matter that he is a big baby? I assume his stomach would still be the same size. He was born at 10 pounds and now weights over 11.