A four-month-old typically drinks 24 to 32 ounces of breast milk or formula per day, spread across five to six feedings. The exact amount varies by your baby’s weight and whether they’re breastfed, formula-fed, or both, but there’s a simple calculation that gets you close to the right number.
Formula-Fed Babies: The 2.5-Ounce Rule
For formula-fed infants, the standard guideline is about 2.5 ounces of formula per day for every pound of body weight. So if your baby weighs 14 pounds, that works out to roughly 35 ounces per day, but you’d cap it at 32 ounces since that’s the recommended daily maximum. A baby weighing 12 pounds would need about 30 ounces.
At four months, most babies take four to six bottles a day, with each bottle holding around five to seven ounces depending on the total number of feedings. Some babies prefer smaller, more frequent bottles while others drink larger amounts less often. Both patterns are normal as long as the daily total falls in the right range.
Breastfed Babies: Frequency Over Volume
Measuring intake is trickier with breastfeeding since you can’t see how much milk your baby is getting. Most exclusively breastfed babies eat eight to twelve times in 24 hours, roughly every two to four hours. Some sessions will be long and others surprisingly quick, and that variation is completely normal. Babies regulate their own intake at the breast and stop when they’re full.
If you’re pumping and bottle-feeding breast milk, the volume per feeding is usually a bit less than formula since breast milk is digested more quickly. A typical range is three to five ounces per bottle, offered on a similar schedule to formula feeding.
How to Tell Your Baby Is Getting Enough
Rather than obsessing over exact ounce counts, your baby’s body gives you reliable signals. Steady weight gain is the best indicator. Between three and six months, babies should gain about two-thirds of an ounce per day, or roughly five ounces per week. Your pediatrician tracks this at well-child visits, but if you’re concerned between appointments, consistent wet diapers (six or more per day) and a baby who seems satisfied after feedings are reassuring signs.
Learning your baby’s hunger and fullness cues makes feeding easier and more intuitive. 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. When your baby is full, they’ll close their mouth, turn away from the breast or bottle, and relax their hands. Crying is actually a late hunger cue. If you can catch the earlier signals, feedings tend to go more smoothly because your baby is still calm.
Night Feedings at Four Months
One to two nighttime feedings are developmentally normal at four months. Some babies sleep a longer stretch of five or six hours before their first night feed, then wake again a few hours later for a second. Others still wake more frequently, and that’s within the range of normal too.
Most babies gradually reduce night feedings on their own between six and nine months, with many dropping to one feeding by around seven to eight months. A few naturally sleep through the night earlier, but expecting a four-month-old to go twelve hours without eating isn’t realistic for most families.
What About Solid Foods?
Four months is the earliest window when some babies start showing signs of readiness for solids, though the AAP recommends exclusive breastfeeding for about six months. If you’re considering introducing food, your baby needs to meet several milestones first: holding their head up steadily, sitting with support in a high chair, showing interest in watching you eat and reaching for food, and being able to swallow from a spoon rather than pushing everything back out with their tongue.
Babies who have doubled their birth weight (usually around 13 pounds) and meet those physical milestones can safely try soft or pureed foods. But at four months, solids are a supplement, not a replacement. Breast milk or formula remains the primary source of nutrition, and any food you introduce should come after a milk feeding, not instead of one. Never put cereal in a bottle, as this poses a choking risk.
Skip the Water and Juice
Babies under six months should not drink water, juice, or any liquid other than breast milk and formula. This might feel counterintuitive, especially on hot days, but breast milk and formula provide all the hydration your baby needs. Water fills up their small stomach without providing calories or nutrients, effectively diluting their diet. More seriously, too much water can lower sodium levels in a baby’s blood, a dangerous condition sometimes called water intoxication. Even small amounts of water at this age are unnecessary and not recommended by the AAP.