HOW MUCH FORMULA DOES A BABY NEED?       Not much at first. In fact, a baby can do without any feedings for the first two days of life. So don’t push more than a baby seems to want, and don’t worry about giving enough. A couple of ounces at a time may be plenty and not more than three or four ounces at a time for the first month. A good rule- of- thumb is to feed a baby no more than one-ounce-per -hour since the last feeding.