A 3-month-old typically drinks 4 to 5 ounces of formula per feeding, or 3 to 4 ounces of expressed breast milk, with a daily total ranging from about 24 to 32 ounces. But the most reliable way to dial in your baby’s exact number is a simple formula: about 2.5 ounces per pound of body weight per day. A 13-pound baby, for example, would need roughly 32 ounces spread across the day.
Daily Totals and Per-Feeding Amounts
Formula-fed 3-month-olds generally eat 5 to 7 times per day, spaced about every 3 to 4 hours. At this age, most bottles fall in the 4-to-5-ounce range, though some feedings will be smaller and others slightly larger. The upper limit to keep in mind is 32 ounces of formula in 24 hours. Babies who consistently exceed that amount may be feeding for comfort rather than hunger.
Breastfed babies follow a different rhythm. They tend to eat more frequently, around 7 to 9 times per day, because breast milk digests faster than formula. If you’re feeding expressed milk from a bottle, expect each feeding to be about 3 to 4 ounces, with a daily total between 24 and 30 ounces. Breast milk intake stays surprisingly stable from about one month through six months, even as your baby grows, because the composition of the milk changes to meet their needs.
The Weight-Based Calculation
Rather than memorizing a chart, you can estimate your baby’s daily intake using their weight. Multiply your baby’s weight in pounds by 2.5, and the result is roughly how many ounces they need per day. Then divide that by the number of feedings to get a per-bottle target.
- 11-pound baby: about 27.5 ounces per day
- 13-pound baby: about 32 ounces per day
- 14-pound baby: about 32 ounces per day (capped at the 32-ounce guideline)
This calculation works well for formula. If your baby weighs more than 12 or 13 pounds, they’ll approach that 32-ounce daily ceiling, and increasing volume beyond that point isn’t necessary. Babies at this stage are growing at an average rate of 1.5 to 2 pounds per month, so the per-feeding amount gradually creeps up over time rather than jumping suddenly.
Reading Your Baby’s Hunger and Fullness Cues
No chart can tell you exactly what your baby needs on a given day. Some days they’ll be hungrier than others, especially during growth spurts. The best guide is your baby’s own signals.
Signs your baby is hungry include putting hands to their mouth, turning their head toward the breast or bottle (called rooting), smacking or licking their lips, and clenching their fists. Crying is actually a late hunger cue. If you can catch the earlier signs, feeding tends to go more smoothly.
When your baby is full, they’ll close their mouth, turn away from the bottle or breast, and visibly relax their hands. Resist the urge to encourage them to finish a bottle. Babies are generally good at regulating their own intake, and pushing past fullness cues can lead to overfeeding and discomfort.
What to Expect With Night Feedings
At 3 months, many babies start consolidating their sleep into one longer stretch of 4 to 5 hours at night, which often means dropping one overnight feeding. Formula-fed babies tend to reach this milestone a bit sooner because formula takes longer to digest, keeping them full for longer stretches. That said, plenty of 3-month-olds still wake once or twice to eat, and that’s completely normal.
Most formula-fed babies can drop night feedings entirely by around 6 months. Breastfed babies often continue needing at least one night feed until closer to 12 months. Between 2 and 4 months, as your baby’s stomach capacity increases, they naturally compensate by taking in more during daytime feedings and spacing them further apart, sometimes going 4 to 5 hours between bottles during the day.
Signs Your Baby Is Getting Enough
The number on the bottle matters less than what’s happening with your baby overall. Steady weight gain of 1.5 to 2 pounds per month is the clearest indicator that intake is on track. Your pediatrician tracks this at well-child visits, but you can also watch for day-to-day signs: six or more wet diapers in 24 hours, your baby seeming satisfied after feedings, and consistent alertness during wake periods.
If your baby is consistently finishing bottles and still showing hunger cues, try adding an ounce to each bottle rather than adding extra feedings. If they’re regularly leaving an ounce or more behind, scale back. Adjusting in small increments lets you match their appetite without overshooting. At this age, all nutrition should come from breast milk or formula. Solid foods, water, and juice aren’t appropriate until around 6 months.