It's tough to judge exactly how many ounces of breast milk your baby consumes when he's nursing, but for the first month or so, babies usually drink about 2 ounces per feeding. However, this varies from baby to baby (larger babies tend to eat more, for example) and even from feeding to feeding. You can start with 2 ounces, and if your baby devours it and seems eager for more, offer another ounce.
Don't worry about overstuffing your baby -- he'll stop when he's full. As your baby gets older and bigger, he'll eat more per feeding and have fewer feeding sessions throughout the day.
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