A 2-week-old typically drinks 2 to 3 ounces of formula per feeding, eating 8 to 12 times over a 24-hour period. That works out to roughly 16 to 24 total ounces per day, though every baby is a little different. The most reliable way to calculate your baby’s specific needs is by weight: about 2.5 ounces of formula per day for every pound your baby weighs.
Calculating Your Baby’s Daily Intake
The weight-based guideline from the American Academy of Pediatrics is straightforward. Multiply your baby’s current weight in pounds by 2.5, and that’s roughly how many ounces of formula they need in a full day. A baby who weighs 8 pounds, for example, would need about 20 ounces total. A 9-pound baby would need closer to 22 or 23 ounces.
Divide that daily total by the number of feedings to get your per-bottle amount. If your baby eats 8 times a day, an 8-pound baby would get about 2.5 ounces per bottle. If they eat 10 times a day, each bottle would be slightly smaller. There’s no single “correct” bottle size, because babies naturally vary in how often they want to eat.
Why Feedings Are Small and Frequent
By day 10 of life, a newborn’s stomach is roughly the size of a ping-pong ball, holding about 2 ounces at a time. It’s physically small, which is why your baby needs to eat so often. Most 2-week-olds feed every 2 to 4 hours around the clock, including overnight. Going longer than 4 hours without a feeding at this age usually isn’t recommended, even if your baby seems content, because they need consistent calories to grow.
Healthy newborns gain about 1 ounce of body weight per day during the first few months. Many babies lose a small percentage of their birth weight in the first few days and are expected to regain it by around 2 weeks of age. If your baby is back to birth weight or above at the 2-week checkup, feeding is on track.
The 2-Week Growth Spurt
Right around 2 to 3 weeks, most babies hit their first major growth spurt. You may notice your baby suddenly acting hungrier, fussing more between feedings, or wanting to eat more frequently than usual. This is normal and temporary, typically lasting a few days.
During a growth spurt, it’s fine to offer an extra half-ounce or an additional feeding when your baby shows hunger cues. Their intake will level off once the spurt passes. You don’t need to force a new schedule. Just follow your baby’s lead and expect things to settle back down within a few days.
How to Tell Your Baby Is Hungry
Crying is actually a late hunger signal. Before that, a 2-week-old will show earlier cues that are easier to catch:
- Rooting: turning their head toward your hand, breast, or the bottle
- Hand-to-mouth movement: bringing fists up to their face or sucking on fingers
- Lip signals: puckering, smacking, or licking their lips
- Clenched hands: tightly balled fists can signal hunger in very young babies
Catching these cues early makes feeding calmer for both of you. A baby who is already crying may swallow more air during the bottle, which leads to extra gas and discomfort.
How to Tell Your Baby Is Full
Fullness cues are just as important as hunger cues, especially with bottle feeding, where it’s easier to accidentally push past what a baby needs. A baby who is done will close their mouth, turn their head away from the bottle, or visibly relax their hands. If your baby was tense and clenched while eating and then opens their fists, that’s a good sign they’ve had enough.
It’s tempting to encourage your baby to finish the last half-ounce in the bottle, but this can lead to overfeeding. An overfed baby often spits up more than usual, has loose stools, and seems uncomfortable or gassy. The discomfort comes from swallowing air and from a stomach that’s been pushed past its small capacity. If your baby regularly leaves a little formula behind, that’s not a problem. It means they’re self-regulating well.
Tracking Output Instead of Ounces
Counting ounces can feel stressful, especially in the middle of the night. A more practical way to confirm your baby is getting enough formula is to track what comes out the other end. A well-fed 2-week-old should produce at least 4 wet diapers per day and at least 1 bowel movement per day. The wet diapers matter most for hydration, and the stool count confirms they’re digesting and absorbing what they take in.
If your baby is meeting those diaper counts, gaining weight steadily, and seems alert during wakeful periods, their intake is likely right where it should be, even if the exact ounce count varies from one feeding to the next.
What a Typical Day Looks Like
For a practical snapshot, here’s what feeding often looks like for a formula-fed 2-week-old weighing about 8 pounds: roughly 2 to 2.5 ounces per bottle, offered every 2.5 to 3 hours, totaling 8 to 10 feedings in a 24-hour period. Some of those feedings will be closer together, especially in the evening when babies tend to cluster-feed. Others, particularly after a deep sleep stretch, may come after a slightly longer gap.
These numbers shift quickly. By 1 month of age, most babies move up to 3 to 4 ounces per feeding with slightly longer stretches between bottles. At 2 weeks, though, small and frequent is the name of the game. Your baby’s appetite will guide you better than any fixed schedule, so treat the ounce ranges as a starting point and adjust based on what your baby tells you.