A 5-week-old baby typically eats 3 to 4 ounces per feeding if bottle-fed, with a total daily intake of around 24 to 32 ounces spread across the day. That said, every baby is a little different, and the right amount depends on whether your baby is getting breast milk or formula, how often they feed, and how fast they’re growing.
Per-Feeding and Daily Totals
By the end of the first month, most babies have worked up to at least 3 to 4 ounces (90 to 120 ml) per feeding. At 5 weeks, your baby is right in this range or possibly starting to push slightly above it. A baby’s stomach at this age is roughly the size of a large chicken egg, which helps explain why small, frequent feedings work better than fewer large ones.
For formula-fed babies, the daily total typically lands around 24 to 32 ounces, divided into about six to ten feedings over 24 hours. Most formula-fed babies settle into a pattern of eating every 3 to 4 hours, though some still cluster feeds closer together at times.
Breastfed babies who take bottles of expressed milk tend to eat 3 to 4 ounces per feeding as well, but they often feed more frequently, roughly eight to twelve times in 24 hours. One useful thing to know: breastfed babies take in roughly the same total volume per day (24 to 30 ounces) from about 4 weeks of age all the way through 6 months. So the per-feeding amount stays relatively stable for a long time, while formula-fed babies gradually increase their volume per bottle as they grow.
Why Your Baby Might Want More (or Less)
Five weeks sits right between two common growth spurts, one around 2 to 3 weeks and another around 6 weeks. If your baby suddenly seems hungrier than usual, wants to eat every hour or two, and is fussier between feedings, you may be seeing the early edge of that 6-week growth spurt. During a growth spurt, babies can want to nurse or bottle-feed significantly more often, sometimes as frequently as every 30 minutes. This is temporary, usually lasting a few days, and it’s your baby’s way of signaling they need more fuel.
On the other end, some 5-week-olds are still on the smaller side and genuinely full after 2.5 or 3 ounces. That’s normal too, as long as they’re gaining weight and producing enough wet diapers.
How to Tell If Your Baby Is Getting Enough
Rather than fixating on exact ounces, your baby’s hunger and fullness cues are the most reliable guide. Before they can talk, babies communicate with their bodies. Early hunger signs include putting hands to their mouth, turning their head toward the breast or bottle (called rooting), puckering or smacking their lips, and clenching their fists. Crying is actually a late hunger signal, so try to catch the earlier cues when you can.
Fullness looks like the opposite: your baby closes their mouth, turns their head away from the bottle or breast, and their hands relax and open. If your baby is doing these things consistently, they’re telling you they’ve had enough, even if there’s still milk left in the bottle. Pushing a baby to finish a bottle they’ve turned away from can lead to overfeeding and spit-up.
Diaper output is another reliable check. After the first week of life, a baby getting enough milk should produce at least six wet diapers per day. The number of poopy diapers varies more, especially in breastfed babies, but consistent wet diapers are a strong sign of adequate hydration.
Breast Milk vs. Formula Differences
If you’re pumping and bottle-feeding breast milk, resist the urge to match the ounce amounts you see on formula feeding charts. Breast milk is digested faster than formula, which is why breastfed babies eat more often but don’t necessarily need more volume per day. A breastfed 5-week-old might take a 3-ounce bottle every 2 to 3 hours, while a formula-fed baby might take a 4-ounce bottle every 3 to 4 hours. Both are getting what they need.
Formula-fed babies tend to increase their per-bottle intake gradually over the coming months. Breastfed babies, by contrast, keep that 3-to-4-ounce-per-feeding volume remarkably steady from one month through six months. If you’re preparing bottles of expressed milk for a caregiver, 3 to 4 ounces per bottle is a safe starting point at this age.
Signs Your Baby Needs a Feeding Adjustment
A few patterns suggest your baby may need more than they’re currently getting: consistently finishing every bottle and still rooting for more, not settling after feedings, fewer than six wet diapers a day, or weight gain that’s plateaued at pediatric checkups. On the flip side, frequent large spit-ups after feedings, a hard distended belly, or your baby gagging and pulling away mid-feed can suggest they’re getting too much at once. Offering smaller amounts more frequently often solves both problems.
Weight checks at your baby’s pediatric visits are the gold standard for confirming adequate intake. Between visits, steady diaper output and a baby who seems satisfied after feedings are the best indicators that the amount is right.