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1 On average, a newborn drinks about 1.5-3 ounces (45-90 milliliters) every 2-3 hours. This amount increases as your baby grows and is able to take more at each feeding.  At about 2 months, your baby may be taking 4-5 ounces (120-150 milliliters) at each feeding and the feedings may be every 3-4 hours.
To determine your baby's daily formula intake range, multiply your baby's weight by two. This is the lower end of how many ounces he needs in a 24-hour period. Then multiply his weight by 2.5. This is the upper range of ounces required within 24 hours. For example, a 12-pound baby would likely need 24 to 30 ounces in a 24-hour period. To determine how many ounces per bottle, divide those amounts by the number of feedings your baby takes per day. In this example, if your baby is taking 6 bottles in 24 hours, he would need approximately 4- to 5-ounce bottles.