A 3-month-old typically eats 4 to 5 ounces per feeding if formula-fed, or 3 to 4 ounces per session if breastfed. Total daily intake generally falls between 24 and 32 ounces, depending on your baby’s weight and whether they’re getting breast milk, formula, or a combination of both.
Formula-Fed Babies: Daily and Per-Feeding Amounts
The standard guideline for formula-fed infants is about 2.5 ounces per day for every pound of body weight. So a 13-pound 3-month-old would need roughly 32 ounces over a full day. Most babies this age eat 4 to 5 ounces per bottle across six to eight feedings. The upper limit is around 32 ounces in 24 hours. Going consistently above that can lead to overfeeding, which often shows up as frequent spit-up, gassiness, or unusual fussiness after meals.
By this age, most formula-fed babies have also dropped the middle-of-the-night feeding, especially once they weigh more than 12 pounds. That means more of their daily intake shifts into daytime hours, and individual bottles may get slightly larger to compensate.
Breastfed Babies: What to Expect
Breastfed 3-month-olds typically take in 3 to 4 ounces per feeding session, totaling 24 to 30 ounces over 24 hours. Breast milk is digested faster than formula, so breastfed babies often eat more frequently, around 8 to 12 times per day. That’s roughly every two to three hours, though the spacing is rarely perfectly even.
If you’re nursing directly, you won’t know the exact ounce count, and that’s completely normal. Steady weight gain, regular wet diapers (at least six per day), and a baby who seems satisfied after feeding are more reliable indicators than measuring volume. If you’re pumping and bottle-feeding expressed milk, 3 to 4 ounces per bottle is a good starting point.
Your Baby’s Stomach Size at 3 Months
A 3-month-old’s stomach holds about 4 ounces at a time. That’s roughly the size of a large egg. This physical limit explains why small, frequent feedings work better than fewer large ones. Pushing past what the stomach can comfortably hold is one of the most common causes of spit-up in young infants. If your baby is consistently draining 5-ounce bottles and still seeming hungry, it’s worth spacing out feedings slightly rather than increasing the volume per bottle right away.
Hunger and Fullness Cues to Watch For
Feeding your baby based on hunger cues rather than a strict schedule gives them the best chance of getting exactly what they need. At 3 months, hunger signals include bringing hands to the face, making sucking noises or motions, rooting against your chest, and sucking on fingers, lips, or nearby objects. Opening and closing the mouth repeatedly is another early sign. Crying is a late hunger cue, and feeding goes more smoothly if you catch the earlier signals.
Fullness cues are just as important. When your baby is done, they’ll slow down or stop sucking, turn their head away from the nipple or bottle, relax and extend their fingers, or push and arch away from you. Many babies simply fall asleep at the breast or bottle when they’ve had enough. Respecting these signals, rather than encouraging your baby to finish every last drop, helps them develop healthy self-regulation around eating from the start.
Why Your Baby May Suddenly Want More
Around 3 months, many babies hit a growth spurt that temporarily changes their feeding pattern. During a growth spurt, your baby may seem hungrier than usual, want to eat every 30 minutes, and act fussier between feedings. This is normal and usually lasts only a few days. Growth spurts commonly happen around 2 to 3 weeks, 6 weeks, 3 months, and 6 months, though the timing varies from baby to baby.
If you’re breastfeeding, the best response to a growth spurt is simply nursing more often. The increased demand signals your body to produce more milk. If you’re formula feeding, offering an extra ounce per bottle or adding a feeding to the day can help your baby through the spurt without overloading any single feeding. Once the growth spurt passes, your baby’s appetite will typically settle back to its previous rhythm.
Signs Your Baby Is Getting Enough
Rather than fixating on a specific ounce target, look at the bigger picture. A well-fed 3-month-old gains weight steadily (your pediatrician tracks this at well-visits), produces at least six wet diapers a day, seems alert and active during awake periods, and appears content after feedings. Some babies are consistently on the lower end of intake ranges and grow perfectly well. Others are bigger eaters from the start. The ranges above are guidelines, not rigid rules, and your baby’s individual pattern matters more than matching an exact number.