A newborn's formula intake varies by age and weight, starting very small and increasing over the first weeks of life. In the first day, newborns typically receive only 0.5–1 ounce per feeding. By day 3, most newborns take 1–2 ounces per feeding, and by the end of the first week, intake often reaches 2–3 ounces per feeding. By 2 weeks old, newborns generally consume 3–4 ounces per feeding.
The general guideline is that newborns eat about 2.5 ounces per pound of body weight per day, divided into 8–12 feedings. So a 7-pound newborn would typically need roughly 17–19 ounces spread throughout the day. Most newborns feed every 2–4 hours, though some variation is normal.
Several factors influence how much formula a baby needs: individual metabolism, the infant's birth weight, growth rate, and hunger cues. Premature infants may follow a different feeding schedule and volume progression. It's important to follow hunger cues rather than forcing a baby to finish a bottle—signs of hunger include rooting, hand-to-mouth movements, and crying, while signs of fullness include pushing away the bottle and showing decreased interest.
Parents should work with their pediatrician to ensure their newborn is gaining weight appropriately and meeting developmental milestones. Wet diapers and stool output are also important indicators that a baby is receiving adequate nutrition.