A 3-month-old typically drinks 4 to 5 ounces per feeding, whether formula or expressed breast milk. Most babies this age eat every 3 to 4 hours, totaling roughly 24 to 32 ounces over a full day. That said, every baby is different, and the right amount depends on your baby’s weight, appetite, and whether they’re going through a growth spurt.
Formula-Fed Babies at 3 Months
The American Academy of Pediatrics recommends about 2.5 ounces of formula per day for every pound of body weight. A 3-month-old who weighs 13 pounds, for example, would need roughly 32 ounces spread across the day. Divided into feedings every 3 to 4 hours, that works out to about 4 to 5 ounces per bottle, sometimes closer to 6 ounces for bigger babies.
The upper limit is generally around 32 ounces of formula in 24 hours. If your baby consistently seems hungry beyond that, it’s worth checking with your pediatrician rather than simply increasing volume.
Breastfed Babies at 3 Months
If you’re nursing directly, measuring ounces isn’t practical or necessary. Your baby regulates their own intake at the breast. What you’ll notice instead is a pattern: most 3-month-olds nurse 6 to 8 times in 24 hours, with some sessions longer or shorter than others.
If you’re offering expressed breast milk in a bottle, the typical amount is 3 to 4 ounces per feeding. One useful detail: breast milk intake stays remarkably stable between about 4 weeks and 6 months of age. Unlike formula-fed babies, who gradually increase their daily volume, breastfed babies tend to take in roughly the same total (24 to 30 ounces per day) throughout that entire stretch. They become more efficient at extracting milk, so feedings may get shorter even though the volume stays consistent.
Why Your Baby’s Stomach Size Matters
At 3 months, a baby’s stomach holds about 4 to 6 ounces. By the time they approach 4 or 5 months, that capacity stretches to 6 or 7 ounces. This is why you’ll see feeding sizes gradually increase over the coming weeks. Trying to push much more than your baby’s stomach can comfortably hold at one sitting leads to spit-up, gas, and fussiness rather than a more satisfied baby.
The 3-Month Growth Spurt
Three months is one of the classic growth spurt windows (along with 2 to 3 weeks, 6 weeks, and 6 months). During a spurt, your baby may suddenly want to eat more frequently, sometimes as often as every 1 to 2 hours, and seem fussier than usual. This can last a few days.
For breastfeeding parents, the frequent nursing serves a second purpose: it signals your body to produce more milk to match your baby’s growing needs. For formula-fed babies, you can offer an extra ounce per bottle and follow your baby’s cues. Growth spurts are temporary, and feeding patterns usually settle back to normal within a few days.
Night Feedings at This Age
Many 3-month-olds are starting to stretch their longest sleep to 4 or 5 hours at a time. Between 2 and 4 months, particularly once a baby weighs more than 12 pounds, most formula-fed babies drop the middle-of-the-night feeding on their own. They’re eating more during the day, and their larger stomach capacity lets them go longer between meals overnight.
This doesn’t happen on a fixed schedule. Some babies still wake once or twice to eat at night, and that’s normal. Breastfed babies sometimes take a bit longer to drop nighttime feeds since breast milk digests faster than formula.
How to Tell if Your Baby Is Getting Enough
Rather than fixating on exact ounces, watching your baby’s hunger and fullness cues is the most reliable guide. A hungry 3-month-old will bring their hands to their mouth, turn their head toward the breast or bottle, smack or lick their lips, and clench their fists. When they’ve had enough, the signals flip: they close their mouth, turn away from the bottle or breast, and relax their hands.
Steady weight gain is the other key indicator. Your pediatrician tracks this at well-child visits. As long as your baby is following their growth curve, producing 6 or more wet diapers a day, and seems content between feedings, they’re almost certainly getting what they need.
Signs of Overfeeding
Overfeeding is more common with bottle-fed babies because milk flows from a bottle even when a baby is passively sucking for comfort rather than hunger. Signs include frequent, large spit-ups (beyond the normal small amount most babies produce), gassiness, belly discomfort, loose stools, and increased crying. An overfed baby swallows extra air along with the excess milk, which compounds the discomfort.
If your baby finishes a bottle and still seems to want to suck, try a pacifier before automatically offering more milk. Some babies have a strong sucking reflex that isn’t always about hunger. Paced bottle feeding, where you hold the bottle more horizontally and let your baby take breaks, can also help them recognize when they’re full before they’ve overdone it.