A 4-month-old typically drinks 4 to 6 ounces of formula per feeding, or breastfeeds 8 to 12 times in 24 hours. Total daily intake for formula-fed babies lands around 24 to 32 ounces, though the exact amount depends on your baby’s weight, appetite, and whether they’re in the middle of a growth spurt.
Formula Feeding at 4 Months
The simplest way to estimate how much formula your baby needs is by weight: about 2.5 ounces per pound of body weight per day. A 14-pound baby, for example, would need roughly 35 ounces total, split across the day’s feedings. Most 4-month-olds eat every 3 to 4 hours, so that typically works out to 4 to 6 ounces per bottle, four to six times a day.
There is a ceiling. Babies should generally drink no more than about 32 ounces of formula in 24 hours. Going beyond that doesn’t offer extra nutritional benefit and can crowd out the hunger and fullness signals your baby is still learning to use. If your baby consistently seems hungry after finishing 32 ounces, it’s worth bringing up at your next pediatrician visit rather than simply adding more formula.
A 4-month-old’s stomach holds roughly 6 to 7 ounces, so offering much more than that in a single feeding just leads to spit-up. Smaller, more frequent bottles are easier on their digestive system than fewer large ones.
Breastfeeding at 4 Months
Breastfed babies feed more often than formula-fed babies because breast milk digests faster. Eight to twelve nursing sessions in 24 hours is typical, and some of those sessions will be short (five minutes) while others stretch longer. That variation is completely normal. Unlike with a bottle, you can’t measure ounces at the breast, so the best way to know your baby is getting enough is by tracking output and growth, which we’ll cover below.
One thing breastfed babies do need that formula-fed babies may not: a daily vitamin D supplement of 400 IU, given as drops. Formula is fortified with vitamin D, so babies drinking 32 ounces or more of formula each day are already covered. Babies getting any amount of breast milk, including those on a mix of breast milk and formula, need the supplement.
Night Feedings and Longer Sleep Stretches
By 4 months, many babies can go 5 or more hours between feedings at night. Some formula-fed babies drop nighttime feeds entirely around this age, especially once they weigh more than 12 pounds. If your baby is still waking more than twice a night to eat at this point, that pattern may be driven more by habit than hunger.
That said, breastfed babies often continue waking once or twice at night for a feeding, and this is within the range of normal. Night feeds help maintain milk supply, so there’s no rush to eliminate them unless you and your pediatrician decide it’s appropriate.
Reading Your Baby’s Hunger and Fullness Cues
Rigid schedules matter less than paying attention to what your baby is telling you. At this age, hunger looks like hands going to the mouth, head turning toward the breast or bottle, and lip smacking or licking. Clenched fists are another early signal. Crying is actually a late hunger cue, so catching those earlier signs makes feedings smoother for everyone.
Fullness is equally readable: your baby will close their mouth, turn away from the breast or bottle, and relax their hands. When you see those signals, stop the feeding. Pushing a baby to finish a bottle trains them to override their own satiety signals, which can set up unhealthy eating patterns later.
Growth Spurts and Temporary Changes
If your baby suddenly seems ravenous, wanting to eat more frequently or draining bottles faster than usual, a growth spurt is the likely explanation. Common growth spurts happen around 3 months and 6 months, so a 4-month-old may be on the tail end of one or gearing up for the next. These bursts of increased hunger typically last a few days, sometimes up to a week, and then feeding patterns settle back to normal.
During a growth spurt, let your baby eat as much as they want. This is their body signaling a genuine need for extra calories. You may also notice more fussiness and changes in sleep. It passes.
How to Tell Your Baby Is Getting Enough
The most reliable day-to-day indicator is diaper output. Six to eight wet diapers in 24 hours is normal and means your baby is well hydrated. Fewer than three or four wet diapers a day is a sign of dehydration and warrants a call to your pediatrician. You should also see regular bowel movements, though the frequency varies widely from baby to baby.
Beyond diapers, steady weight gain is the gold standard. Your pediatrician tracks this at well-child visits using a growth chart. Babies don’t need to be at a specific percentile. What matters is that they’re following a consistent curve over time rather than suddenly dropping off.
Signs that your baby may not be getting enough include persistent fussiness after feedings, dark yellow urine, dry lips, and sluggishness. On the flip side, frequent large spit-ups after every feeding, along with consistent fussiness, can sometimes signal overfeeding.
What About Solid Foods?
At 4 months, your baby’s nutrition should still come entirely from breast milk, formula, or a combination of both. The American Academy of Pediatrics and the Dietary Guidelines for Americans recommend introducing solid foods at about 6 months, and starting before 4 months is not recommended.
Some babies show early interest in food around 4 to 5 months, reaching for what you’re eating or watching intently at mealtimes. Interest alone isn’t enough. Before starting solids, your baby needs to be able to sit up with support, control their head and neck, swallow food rather than pushing it out with their tongue, and bring objects to their mouth. Most babies don’t hit all of these milestones until closer to 6 months.