A 4-month-old typically drinks 24 to 32 ounces of milk per day, whether that’s formula or breast milk. The exact amount depends on your baby’s weight, feeding style, and individual appetite, but most babies at this age settle into a fairly predictable pattern of 4 to 6 ounces per feeding, spread across several sessions throughout the day and night.
Daily Totals for Formula-Fed Babies
A reliable way to estimate your baby’s formula needs is the weight-based rule: 2.5 ounces of formula per pound of body weight every 24 hours, with a maximum of about 32 ounces. The average 4-month-old weighs between 13 and 15 pounds, which puts the daily target somewhere around 32 ounces for most babies. If your baby is on the smaller side at 12 pounds, that works out to about 30 ounces. A larger baby at 15 pounds would hit the 32-ounce ceiling.
That 32-ounce cap matters for a practical reason beyond just volume. Babies getting at least 32 ounces of formula daily are getting enough vitamin D from the fortified formula itself. Babies drinking less than that may need a vitamin D supplement.
Most formula-fed 4-month-olds take 4 to 6 ounces per bottle and eat five to six times in 24 hours. Some babies prefer smaller, more frequent bottles, while others consolidate into fewer, larger feeds. Both patterns are normal as long as the daily total lands in the right range and your baby is gaining weight steadily.
Daily Totals for Breastfed Babies
Breastfed babies at this age typically take 3 to 4 ounces per feeding session. They tend to eat more frequently than formula-fed babies, often 8 to 12 times in 24 hours, because breast milk digests faster than formula. That frequency can feel relentless, but it’s biologically normal.
If you’re pumping and bottle-feeding expressed milk, those 3-to-4-ounce portions are a good starting point. One common mistake is offering breastfed babies the same large bottles formula-fed babies get. Breast milk and formula are digested differently, so a breastfed baby who seems hungry again after 3 ounces likely just needs to eat again sooner rather than getting a bigger bottle.
Tracking exact ounces is harder when nursing directly, which is why pediatricians rely on weight gain and wet diapers rather than volume. Six or more wet diapers a day and consistent growth on the curve are the most reliable signs your baby is getting enough.
How to Tell Your Baby Is Full
Numbers are a useful guide, but your baby’s hunger and fullness cues are the best real-time measure. At 4 months, babies are getting better at communicating when they’ve had enough. The clearest signs of fullness include closing their mouth, turning their head away from the breast or bottle, and relaxing their hands. A hungry baby tends to have clenched fists and an alert, searching posture, so when those hands go soft and floppy, the feeding is probably done.
Resist the urge to finish every last ounce in the bottle. Pushing past fullness cues can override your baby’s natural ability to self-regulate intake, and it can lead to spit-up and discomfort in the short term.
Night Feedings at 4 Months
By 4 months, many babies can stretch 5 or more hours between feedings overnight. Most still need one or two night feeds, but waking more than twice per night to eat at this age may signal a habit rather than genuine hunger. If your baby is taking full feeds during the day and gaining weight well, those extra overnight wake-ups might be more about comfort than calories.
That said, some babies genuinely need those extra feeds, especially smaller babies or those going through a growth spurt. The 4-month mark is a common growth spurt window, and you may notice your baby suddenly wanting to eat more frequently for a few days before settling back to their usual pattern.
When Milk Alone Starts to Shift
Four months is the earliest age at which solid foods can be introduced, but most pediatricians recommend waiting until closer to 6 months. The key isn’t the calendar. It’s whether your baby shows specific readiness signs: sitting up with support, having good head and neck control, opening their mouth when offered food, and swallowing rather than pushing food back out with their tongue. At 4 months, many babies haven’t hit all of those milestones yet.
Until solids are in the picture, breast milk or formula provides 100% of your baby’s nutrition. There’s no need to supplement with water, juice, or cereal in the bottle. If your baby seems hungrier than usual but isn’t ready for solids, the answer is simply more milk, more often, staying within that 32-ounce daily ceiling for formula or following your baby’s cues at the breast.