A 3-month-old typically drinks 4 to 5 ounces per feeding if formula-fed, or 3 to 4 ounces per feeding if taking expressed breast milk. Over a full 24-hour period, most babies this age consume somewhere between 24 and 32 ounces total. That said, every baby is different, and the right amount depends more on your baby’s hunger and fullness cues than on hitting an exact number.
Formula-Fed Babies at 3 Months
Most formula-fed 3-month-olds take about 4 to 5 ounces per bottle, spaced every 3 to 5 hours. That works out to roughly 6 to 8 feedings per day. Total daily intake usually falls between 24 and 32 ounces, though some bigger babies may drink slightly more.
The CDC notes that babies getting 32 ounces or more of formula per day don’t need a separate vitamin D supplement, since formula is already fortified. If your baby is consistently taking less than 32 ounces, ask your pediatrician whether a vitamin D drop is needed.
Breastfed Babies at 3 Months
Breastfed babies tend to eat more frequently than formula-fed babies. At 2 to 3 months old, expect around 8 to 10 nursing sessions in 24 hours. If you’re feeding expressed milk from a bottle, the typical amount is 3 to 4 ounces per session, with a daily total of 24 to 30 ounces.
One thing that surprises many parents: breastfed babies don’t steadily increase their intake the way formula-fed babies do. Breast milk changes in composition as your baby grows, becoming more calorie-dense, so the volume stays relatively stable from about 1 month through 6 months. A 3-month-old and a 5-month-old may drink roughly the same number of ounces per day.
How to Tell Your Baby Is Hungry
Ounce targets are useful guidelines, but your baby’s own signals are the most reliable measure. At this age, hunger cues include putting hands to their mouth, turning their head toward your breast or the bottle, smacking or licking their lips, and clenching their fists. Crying is actually a late hunger cue. If you can catch the earlier signals, feeding tends to go more smoothly.
When your baby is full, they’ll close their mouth, turn their head away from the breast or bottle, and relax their hands. Some babies also get drowsy or simply lose interest. Pushing past these signals to finish a bottle can lead to overfeeding and more spit-up, so it’s fine to stop even if there’s formula left.
Signs Your Baby Is Getting Enough
If you’re breastfeeding, you can’t see exactly how much milk your baby is taking, which makes it harder to know if intake is on track. The most reliable check is diaper output. By the end of the first week and continuing through these early months, your baby should produce at least 6 wet diapers per day. Poop frequency varies more. Some breastfed babies go several days between bowel movements after the first 6 weeks, which is normal as long as the stool is soft when it does come.
Steady weight gain is the other key marker. In the first few months, babies gain about 1 ounce per day on average, which works out to roughly 5 to 7 ounces per week. That rate starts to slow around 4 months. Your pediatrician tracks your baby’s growth on a percentile chart at each well visit, which is the best way to confirm that feeding is going well over time.
Why Some Feedings Are Bigger Than Others
It’s completely normal for your baby to drink 5 ounces at one feeding and only 3 at the next. Babies naturally adjust their intake based on how hungry they are, how well they slept, and whether they’re going through a growth spurt. During growth spurts, which commonly happen around 3 months, your baby may seem ravenous for a few days and then settle back to their usual pattern.
The total over 24 hours matters more than any single feeding. If your baby drinks less at one session, they’ll usually make up for it at the next one. Trying to force a set number of ounces at every feeding often backfires, leading to fussiness or spit-up.
When Intake Seems Too Low or Too High
A 3-month-old consistently drinking fewer than 20 ounces per day, producing fewer than 6 wet diapers, or failing to gain weight may not be getting enough. Frequent fussiness during or right after feeds, especially combined with poor weight gain, can also signal a problem like reflux or a milk protein sensitivity.
On the other end, a baby regularly finishing more than 36 ounces of formula per day may be eating for comfort rather than hunger. This is more common with bottle feeding, since milk flows from a bottle with less effort than from the breast. Paced bottle feeding, where you hold the bottle more horizontally and let the baby take breaks, can help slow things down and give your baby time to recognize fullness.