A 4-month-old typically drinks 3 to 4 ounces of breastmilk per feeding, with most babies eating 8 to 12 times in a 24-hour period. That works out to roughly 24 to 32 ounces total per day, though some babies fall slightly outside this range and do just fine.
How Much Per Feeding
Between 1 and 6 months of age, the standard bottle of expressed breastmilk is 3 to 4 ounces. This lines up with stomach capacity at this age: a baby’s stomach between 3 and 6 months holds about 6 to 7 ounces, but it doesn’t need to be filled completely for a feeding to be adequate. Most babies are comfortable and satisfied with 3 to 4 ounces at a time.
One thing that surprises many parents is that breastmilk intake doesn’t increase dramatically after the first month or two. Unlike formula, where volumes tend to climb steadily, breastmilk composition changes over time to match a growing baby’s caloric needs. So a 4-month-old often drinks a similar volume per feeding as a 2-month-old, even though they weigh more.
How Often to Feed
Most exclusively breastfed babies eat every 2 to 4 hours, landing somewhere around 8 to 12 feedings per day. At 4 months, many babies start spacing their feedings a bit more than they did as newborns, so you might notice sessions settling closer to every 3 hours during the day with one or two longer stretches at night.
If your baby is nursing directly at the breast rather than taking bottles, you won’t know the exact ounce count, and that’s completely normal. Breastfeeding is designed to work on demand. The number of feedings matters more than measuring volume when you’re nursing directly.
Signs Your Baby Is Getting Enough
Since you can’t always measure intake precisely, hunger and fullness cues are your most reliable guide. A hungry 4-month-old will put their hands to their mouth, turn their head toward the breast or bottle, pucker or smack their lips, and clench their fists. When they’re full, those signals reverse: they’ll close their mouth, turn their head away, and relax their hands.
Weight gain is the other key indicator. At this age, babies typically gain about 1 to 1ΒΌ pounds per month. Your pediatrician tracks this at well-child visits, but steady weight gain between appointments is the strongest evidence that your baby is eating enough. Consistent wet diapers (six or more in 24 hours) are another reliable day-to-day signal.
The 4-Month Growth Spurt
Many babies go through a growth spurt right around 4 months, and it can throw off the feeding patterns you’ve gotten used to. During a spurt, your baby may suddenly seem hungry all the time, want to nurse more frequently, sleep differently, and act fussier than usual. This is temporary. Growth spurts in babies typically last up to three days.
The best response is simply to feed on demand. If your baby is showing hunger cues more often, offer the breast or an extra bottle. Your milk supply adjusts to increased demand within a day or two if you’re nursing directly. Don’t assume something is wrong just because your baby wants to eat every hour for a couple of days.
What About Solids at 4 Months?
At 4 months, breastmilk (or formula) should still be your baby’s only source of nutrition. The American Academy of Pediatrics and the Dietary Guidelines for Americans recommend introducing solid foods at about 6 months. Starting solids before 4 months is not recommended, and most pediatricians advise waiting until closer to 6 months unless there’s a specific reason to start earlier.
If your baby seems hungrier than usual at 4 months, the answer is more milk, not cereal or purees. Their digestive system and motor skills are still developing, and breastmilk alone provides everything they need nutritionally at this stage.
If You’re Pumping and Bottle-Feeding
Parents who pump often want a concrete number to aim for when preparing bottles. Start with 3 to 4 ounces per bottle, and let your baby’s cues tell you whether to adjust. It’s better to prepare smaller bottles and offer a second serving if your baby is still hungry than to fill a large bottle and pressure them to finish it. Breastmilk is too valuable to waste, and overfeeding from a bottle is easier than overfeeding at the breast because milk flows more freely from a nipple.
Paced bottle feeding helps with this. Hold the bottle at a more horizontal angle and let your baby take breaks, which mimics the rhythm of breastfeeding and gives them time to register fullness. If your baby consistently drains 4-ounce bottles and still seems hungry, try offering 4.5 or 5 ounces, but watch for fullness cues rather than encouraging them to finish every drop.
For daycare or a caregiver, a good rule of thumb is to send 1 to 1.5 ounces of breastmilk for every hour you’ll be away. So an 8-hour day would call for roughly 8 to 12 ounces, divided into bottles of 3 to 4 ounces each.