On average, by the end of the first month, she should be taking in at least 4 ounces of formula per feeding. At 6 months of age, she’ll be consuming 6 to 8 ounces per feeding. You can also rely on your baby’s diapers to give you clues on whether she’s getting enough to eat. In the first month of your newborn’s life, she should wet her diaper 6 or more times a day and have 3 to 4 (often more) bowel movements each day.