This guide is based on recommendations from the American Academy of Pediatrics (AAP), CDC, and other authoritative sources.
For the first six months of life, your baby needs just one thing: Milk. Breast milk, infant formula, or both. No water, no juice, no solid foods. Everything they need to grow, develop, and thrive is in that milk.
It’s also important to remember that breast milk and formula provide all the fluid a baby needs for the first 6 months — no water is needed. Giving water (or diluted formula) to a young infant can cause water intoxication (a dangerous dilution of blood sodium levels) and can also displace the calorie-dense breast milk or formula babies need for growth.
This article covers how much to expect your baby to eat at each stage, how to read their hunger and fullness cues, and when to call your pediatrician.
How much does my baby actually need?
Breastfed babies
One of the harder things about breastfeeding is not being able to see how many ounces your baby is taking. The reassuring thing is that you don't need to know the number. What matters is that your baby is feeding frequently, seems satisfied after most feedings, and is gaining weight consistently.
Breastfed newborns typically nurse every 2–3 hours, or 8–12 times per day. Breast milk is digested more quickly than formula, so breastfed babies tend to feed more often — especially in the early weeks. That's normal and expected, and it also helps establish and maintain milk supply.
Formula-fed babies
The AAP's most useful general guideline is that babies need roughly 2.5 ounces of formula per pound of body weight per day. A 10-pound baby needs about 25 ounces per day, spread across multiple feedings.
Your baby's cues matter more than the math. Some days they'll want more; some days less. What matters is a consistent pattern of growth, enough wet diapers, and a baby who seems satisfied after feedings.
Most babies do well up to about 32 ounces per day. Beyond this, additional formula doesn't typically provide meaningful extra nutrition. If your baby consistently seems to want more than this, it's worth a conversation with your pediatrician about whether it's time to start solids.
1–4 weeks (newborn) feeding guide
Newborn stomachs are tiny — roughly the size of a cherry in the first days of life. Small, frequent feedings are both normal and necessary.
1–2 months feeding guide
Feeding starts to become more predictable. Most babies establish a fairly consistent pattern by 4–6 weeks. Formula-fed babies' total daily intake edges toward 24–32 oz.
3–4 months feeding guide
Formula-fed babies often plateau around 32 oz total daily intake during this window — this is normal and not a sign they need more. For breastfed babies, consistent weight gain and at least 6 wet diapers per day are the most reliable indicators of adequate intake.
5–6 months feeding guide
Feeding frequency drops and volume per bottle increases. Solids are coming soon — but not yet. The AAP recommends waiting until around 6 months, when your baby shows signs of developmental readiness. Formula and/or breast milk remain the primary source of nutrition throughout the first year, even after solids begin.
Reading hunger and fullness cues
Responsive feeding: Following your baby's cues, rather than encouraging them to finish a set amount, is the AAP's recommended approach for all infants at the breast and the bottle. It supports healthy self-regulation and reduces the risk of overfeeding.
Early hunger cues: Rooting, sucking on hands, turning head side to side, opening mouth, increased alertness. These are the cues to watch for — crying is a late hunger signal.
Late hunger cues: Crying, fussiness. A very hungry baby may feed more frantically and swallow more air. Catching hunger earlier makes feeding smoother.
Fullness cues: Slowing down mid-feed, turning head away, relaxing their hands, releasing the nipple or breast, falling asleep. When your baby signals they're done, stop — even if there's formula left in the bottle.
Vitamin D
Breastfed and partially breastfed babies don’t get enough Vitamin D, which is why the AAP recommends that all breastfed and partially breastfed babies receive 400 IU of vitamin D per day, beginning soon after birth. Vitamin D is typically given to an infant through drops.
If your baby is formula-fed, all formulas contain vitamin D — but a supplement is still generally recommended until your baby is taking about 32 ounces of formula per day. Ask your pediatrician about Vitamin D supplementation at an early visit after birth.
Signs your baby is getting enough
- Feeding frequency: Consistent with the age-appropriate ranges above
- Wet diapers: At least 6 per day after the first week — a reliable daily indicator of adequate intake
- Weight gain: Your pediatrician tracks this at every well-child visit — the most reliable overall indicator of adequate nutrition
- Contentment: A well-fed baby is generally calm between feedings, alert when awake, and settles after eating
Tip: Tracking feeds and wet diapers in the Nara Baby app makes it easier to spot patterns and notice early if something seems off — especially useful in those first weeks when everything feels new.
When to call your pediatrician
- Your baby consistently takes significantly less than the expected range for their age and weight for more than 2 days
- Forceful or projectile vomiting after feedings
- Fewer than 6 wet diapers per day after the first week
- Blood in stool, extreme fussiness after feedings, or significant feeding discomfort
- Any concern about your baby's weight gain or feeding pattern
What comes next
Around 6 months, when your baby shows developmental readiness signs, it's time to start thinking about solid foods. Formula or breast milk remains the primary nutrition source throughout the first year — solids come alongside milk, not instead of it.
Read: 6-8 Months: Starting Solids →
