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Here is a chart of average pumped milk intake by weight:8 lbs 21.3 oz per day, 9 lbs 24.0 oz per day,
10 lbs 26.7 oz per day, 11 lbs 29.3 oz per day,12 lbs 32.0 oz per day, 13 lbs 34.7 oz per day,14 lbs 37.3 oz per day, 15 lbs 40.0 oz per day,16 lbs 42.7 oz per day.
If you'd like to continue this chart, take a baby's weight in pounds and multiply by 2.67. That gives you average number of ounces per day. Then take the total ounces and divide by the daily feedings to find out how much to put in a bottle.