A standard 12.5-ounce can of powdered infant formula makes roughly 90 ounces of prepared formula, which lasts most newborns about 3 days and older babies closer to 2 days. The exact number depends on your baby’s age, how much they eat per feeding, and the specific brand you use. There’s also a safety clock ticking once you pop that seal: opened powder should be used within one month.
How Many Bottles One Can Makes
Most powdered infant formulas use a ratio of one unpacked, level scoop (about 8.8 grams) per 2 ounces of water. A 12.5-ounce can (roughly 355 grams) therefore contains around 40 scoops, which translates to about 80 fluid ounces of prepared formula. Larger cans, typically 21 to 36 ounces of powder, yield proportionally more. A 21-ounce can produces roughly 150 ounces of prepared formula, and a 36-ounce tub gets you close to 260 ounces.
These numbers vary slightly between brands because scoop sizes aren’t universal. The label on your specific can will list how many fluid ounces of formula the container makes, so check that number rather than relying on a generic estimate.
How Fast Your Baby Goes Through It
Your baby’s age is the biggest factor in how quickly a can disappears. Here’s a rough breakdown of daily intake at different stages:
- First month: Babies work up to about 3 to 4 ounces per feeding, reaching around 32 ounces per day by the end of the month. A standard 12.5-ounce can lasts about 2.5 days at that rate.
- 1 to 4 months: Most babies level off near 32 ounces a day, which is the general upper limit pediatricians recommend. A small can lasts 2 to 3 days; a large 36-ounce tub lasts roughly a week.
- 6 months and beyond: Babies typically drink 6 to 8 ounces per feeding across 4 or 5 feedings a day, still landing around 24 to 32 ounces daily. Once solid foods enter the picture, formula intake often dips slightly, stretching each can a bit further.
A common guideline is that babies need about 2.5 ounces of formula per day for every pound of body weight. So a 10-pound baby drinks roughly 25 ounces a day, while a 14-pound baby needs closer to 32. You can use that formula along with the total yield on your can’s label to estimate how many days a single container will cover.
Quick Math for Any Can Size
To figure this out for whatever brand and size you have, divide the total prepared ounces (listed on the label) by your baby’s daily intake. For example, if a can makes 158 ounces and your 4-month-old drinks about 30 ounces a day, that can covers roughly 5 days. If you buy a smaller travel can that makes 80 ounces, it lasts the same baby about 2.5 days.
For budgeting, most exclusively formula-fed babies go through roughly 8 to 10 standard 12.5-ounce cans per month, or about 3 to 4 of the large tubs.
The One-Month Rule for Opened Powder
Once you break the foil seal on a can of powdered formula, the FDA recommends using the contents within one month. After that, the powder is more susceptible to moisture and bacterial contamination, even if the lid has been replaced tightly. This time limit matters most for supplementing parents who use formula only occasionally. If your baby drinks formula full-time, you’ll finish a can well before the month is up. But if you’re combining breastfeeding with a few formula bottles per week, a large tub could expire before it’s empty, making a smaller can a smarter buy.
Write the date you opened the can on the lid with a marker so you don’t have to guess later.
Prepared Bottles Have a Shorter Window
The one-month rule applies to the dry powder sitting in the can. Once you mix a bottle with water, different timelines kick in. Prepared formula left at room temperature is safe for 2 hours. If your baby has already started drinking from the bottle, that window shrinks to just 1 hour, because saliva introduces bacteria that multiply quickly in the warm, nutrient-rich liquid.
If you mix a bottle and your baby doesn’t need it right away, put it in the refrigerator immediately. Refrigerated prepared formula stays safe for up to 24 hours, as long as no one has drunk from it yet. This makes it practical to prepare several bottles at once for overnight feedings or daycare, but any bottle that’s been partially consumed and sat for more than an hour needs to be poured out.
Tips to Get the Most From Each Can
Wasted formula adds up fast. A few habits help you use every scoop:
- Start with smaller bottles. If your baby sometimes finishes 4 ounces and sometimes only drinks 2, prepare 2 ounces first. You can always mix more, but you can’t save a half-finished bottle that’s been sitting out.
- Match can size to usage. Exclusively formula-fed babies benefit from the lower per-ounce cost of large tubs. Combo-fed babies waste less with smaller cans they can finish within the one-month window.
- Store the can properly. Keep opened powder in a cool, dry place with the lid on tightly. Avoid storing it near the stove, dishwasher, or anywhere that gets warm and humid.
- Level your scoops. Heaping scoops use more powder than necessary and throw off the water-to-powder ratio your baby needs. Use the flat edge of a clean knife to level each scoop.