A 6-week-old typically eats 3 to 4 ounces per feeding, totaling roughly 24 to 32 ounces over a full day. The exact amount depends on whether your baby is breastfed or formula-fed, how much they weigh, and whether they’re in the middle of a growth spurt, which commonly happens right around the 6-week mark.
Daily and Per-Feeding Amounts
A useful rule of thumb from pediatricians: babies need about 2.5 ounces of formula per day for every pound of body weight. So a 10-pound baby would need roughly 25 ounces spread across the day. Most 6-week-olds weigh between 8 and 12 pounds, which puts the daily range at about 20 to 30 ounces for most babies.
At this age, feedings typically happen every 3 to 4 hours, which works out to about 6 to 8 feedings per day. Each feeding usually lands in the 3- to 4-ounce range, though some babies take a little more or less depending on timing. A baby who goes a longer stretch overnight, for instance, may drink a larger bottle in the morning.
For breastfed babies, volumes are similar when measured as expressed milk: about 3 to 4 ounces per feeding and 24 to 30 ounces total per day. One difference is that breastfed babies often feed more frequently, sometimes every 2 to 3 hours, because breast milk digests faster than formula. The daily total still falls in the same ballpark. If you’re nursing directly, you won’t be measuring ounces, so tracking wet diapers (at least 6 per day) and steady weight gain are the best indicators that your baby is getting enough.
Why the 6-Week Growth Spurt Changes Things
Six weeks is one of the most common times for a growth spurt. During these periods, babies get noticeably fussier and want to eat more often, sometimes as frequently as every 30 minutes for breastfed infants. This can feel alarming, but it’s normal and temporary, usually lasting 2 to 3 days.
If you’re breastfeeding, the increased demand is actually what signals your body to produce more milk. Supplementing with formula during a growth spurt can short-circuit that process, so try to follow your baby’s lead. For formula-fed babies, you may need to offer an extra ounce per bottle or add an extra feeding to the day. The general upper limit is about 32 ounces of formula in 24 hours. Babies who consistently take more than that should be checked by a pediatrician to make sure overfeeding isn’t causing discomfort.
How to Tell If Your Baby Is Hungry or Full
Crying is actually a late hunger signal. By the time your baby is wailing, they’ve already been hungry for a while. Earlier cues to watch for include putting hands to their mouth, turning their head toward your breast or the bottle (called rooting), lip smacking or licking, and clenched fists.
Fullness cues are just as important. When your baby closes their mouth, turns away from the breast or bottle, or relaxes their hands, they’re telling you they’ve had enough. Babies are generally good at self-regulating intake, so pushing them to finish a bottle after these signals can lead to overfeeding and spit-up. If your baby consistently leaves half an ounce in the bottle, try preparing slightly less next time.
Stomach Size at This Age
A baby between 1 and 3 months old has a stomach that holds roughly 4 to 6 ounces. This is why small, frequent feedings work better than larger, spaced-out ones. Offering 6 ounces to a 6-week-old might seem efficient, but their stomach simply can’t handle that volume comfortably. Sticking to 3 to 4 ounces per feeding matches both their stomach capacity and their digestive pace.
Tracking Whether Your Baby Is Getting Enough
The clearest sign that feeding is going well is steady weight gain. At this age, babies gain about 1 ounce per day, or roughly 5 to 7 ounces per week. Your pediatrician tracks this at well-baby visits, but if you’re concerned between appointments, many pediatric offices will let you come in for a quick weight check.
Other reassuring signs: your baby has at least 6 wet diapers a day, seems satisfied after feedings (not frantically rooting again within minutes), and is alert and active during wake periods. Babies who aren’t getting enough milk often seem unusually sleepy, have fewer wet diapers, or fail to regain their birth weight by 2 weeks of age.
Keep in mind that daily intake can vary. Your baby might drink 28 ounces one day and 24 the next. What matters is the overall pattern across days and weeks, not any single feeding or any single day.