How many ounces should a 3-month-old eat?
3-month-olds will generally drink 4 to 6 ounces of formula around every four hours. That adds up to 24 to 36 ounces of formula in around six feedings total in a 24-hour period. 4-month-olds will often drink 5 to 7 ounces of formula every four to five hours.