A 4-month-old typically drinks 4 to 6 ounces of formula per feeding, totaling roughly 24 to 32 ounces over 24 hours. Breastfed babies take in similar volumes but regulate their own intake at the breast, so the focus shifts to feeding frequency and signs of fullness rather than exact ounces. Either way, breast milk or formula should be your baby’s only source of nutrition at this age.
Formula Intake at 4 Months
By 4 months, a baby’s stomach can hold about 4 ounces (118 ml) per feeding, which is roughly the size of a large egg. Most formula-fed babies at this stage take 4 to 6 ounces every 3 to 4 hours, landing somewhere around 24 to 32 ounces total per day. Some hungrier babies push slightly above that range, but consistently exceeding 32 ounces daily is worth flagging with your pediatrician.
That 32-ounce mark matters for another reason: babies drinking at least that much vitamin D-fortified formula each day don’t need a separate vitamin D supplement. If your baby regularly falls below 32 ounces, the recommendation is 400 IU of liquid vitamin D drops daily.
Breastfeeding Frequency and Volume
Breastfed babies typically nurse 8 to 12 times in 24 hours during the early months, though by 4 months many settle into a slightly more predictable pattern of 6 to 8 sessions. Some feeds are long, others are quick, and that variation is normal. Unlike formula feeding, there’s no way to measure ounces at the breast, so you rely on other signals to know your baby is getting enough.
Breastfed and partially breastfed babies need 400 IU of liquid vitamin D daily, starting soon after birth and continuing until they’re weaned or drinking enough fortified formula to cover the gap.
How to Tell Your Baby Is Getting Enough
The most reliable indicator is weight gain. At 4 months, healthy babies gain about 20 grams per day (roughly 4.5 ounces per week), a pace that’s noticeably slower than the rapid growth of the first few weeks. Your pediatrician tracks this on a growth chart, and steady progress along your baby’s own curve matters more than hitting an exact number.
Between checkups, diaper output gives you a daily read. You should see at least 6 wet diapers in 24 hours. Bowel movements become less predictable around this age. Some babies go once a day, others once every several days, and some healthy babies older than 6 weeks may go up to a week between stools. That’s not a concern as long as weight gain stays on track.
Reading Hunger and Fullness Cues
At 4 months, your baby communicates hunger and satisfaction through clear physical signals. Learning to read them helps you feed the right amount without relying solely on ounce counts.
Hunger looks like hands going to the mouth, head turning toward the breast or bottle, lip smacking or licking, and clenched fists. Crying is a late hunger signal, so catching the earlier cues makes feedings smoother for both of you.
Fullness looks like closing the mouth, turning away from the breast or bottle, and relaxed, open hands. When you see these signs, stop the feeding even if there’s formula left in the bottle. Pushing a baby to finish creates discomfort and overrides the natural appetite regulation they’re developing.
Signs of Overfeeding
Overfeeding is more common with bottle feeding (breast or formula) because the flow is harder for a baby to control. A baby who’s regularly getting too much may spit up more than usual, have unusually loose stools, seem gassy, and cry from belly discomfort. Swallowing extra air during overly large feedings adds to the problem. If your baby seems fussy after most feeds and is consistently above the expected intake range, smaller and more frequent bottles often help.
Night Feedings at 4 Months
By 4 months, many babies can stretch 5 or more hours between feedings overnight. One or two night feeds is still typical and normal. If your baby is waking more than twice a night to eat at this age, the wake-ups may be driven more by habit or comfort than hunger, and it could be worth gradually adjusting the routine.
Daytime intake affects nighttime patterns. Babies who feed well during the day are more likely to drop night feeds on their own. If you’re trying to consolidate sleep, making sure your baby gets full, satisfying feeds during waking hours is a practical first step.
Solids Are Not on the Menu Yet
Four months sits right at the edge of when some parents start wondering about solid foods. The World Health Organization recommends exclusive breastfeeding for the first 6 months, with solid foods introduced around that time when a baby’s nutritional needs begin to outpace what milk alone provides. Some pediatricians green-light starting solids between 4 and 6 months if a baby shows developmental readiness (sitting with support, good head control, interest in food), but breast milk or formula remains the primary nutrition source either way. At 4 months, milk covers everything your baby needs.