A standard 12.5-ounce can of powdered infant formula makes roughly 90 fluid ounces of prepared formula, which lasts most newborns about a week. As your baby grows and drinks more, that same can will run out faster, sometimes in just three or four days by the time they’re a few months old. How quickly you go through a can depends on your baby’s age, the container size, and the specific brand’s mixing ratio.
How Many Bottles One Can Produces
Most standard powdered formulas use a ratio of one unpacked, level scoop of powder to about 2 fluid ounces of water, yielding roughly 2 ounces of prepared formula per scoop. A single scoop of powder typically weighs around 8 to 9 grams. A standard 12.5-ounce (354-gram) can contains enough powder for approximately 90 fluid ounces of mixed formula. Some brands sell larger containers at 20 ounces or more, which stretch further and often cost less per ounce.
The exact yield varies by brand because scoop sizes and mixing instructions differ slightly. Always follow the directions on your specific container rather than assuming a universal ratio. Using too much or too little water changes the calorie concentration your baby receives.
How Fast You’ll Go Through a Can by Age
Newborns start small, taking just 1 to 2 ounces every 2 to 3 hours. That adds up to roughly 16 to 24 ounces per day in the first week or two, meaning a standard 12.5-ounce can of powder could last about 4 to 6 days.
By one to two months, most babies drink 3 to 4 ounces per feeding, six to eight times a day. That’s around 24 to 32 ounces daily, and a standard can lasts closer to 3 or 4 days. By four to six months, intake climbs to about 28 to 36 ounces a day for many babies, burning through a standard can in roughly 2.5 to 3 days. Once solid foods enter the picture around 6 months, formula intake gradually levels off or decreases, slowing consumption somewhat.
Here’s a rough breakdown for a standard 12.5-ounce can (approximately 90 oz prepared):
- Newborn (0–2 weeks): roughly 16–24 oz/day, can lasts about 4–6 days
- 1–2 months: roughly 24–32 oz/day, can lasts about 3–4 days
- 3–5 months: roughly 28–36 oz/day, can lasts about 2.5–3 days
- 6+ months (with solids): roughly 24–32 oz/day, can lasts about 3–4 days
These are averages. Some babies consistently drink more or less than their peers, and appetite varies day to day.
How Many Cans Per Month to Budget For
For a newborn exclusively formula-fed, plan on roughly 4 to 6 standard cans per month. By 3 months, that number rises to about 7 to 10 cans of a 12.5-ounce size. Buying larger containers (20 ounces or value-sized tubs) reduces the number of packages, and typically brings the per-ounce cost down. If your baby drinks around 30 ounces a day, you’ll use roughly 900 ounces of prepared formula per month, which translates to about 10 standard cans or 5 to 6 larger ones.
How Long an Opened Can Stays Good
Once you break the seal on a can of powdered formula, the powder stays safe to use for up to 4 weeks. After that, discard whatever remains, even if the can still looks and smells fine. Write the date you opened it directly on the lid so you don’t lose track. Store the open container in a cool, dry place with the lid tightly sealed. Avoid keeping it near heat, moisture, or direct sunlight.
If you notice any changes in the powder’s smell, color, or texture (unusual clumping, an off odor), throw it away regardless of how recently you opened it. Also check the printed expiration date before opening any new container. Expired formula should not be used.
How Long Prepared Formula Lasts
Once you mix powder with water, the clock starts. Prepared formula left at room temperature is safe for up to 2 hours. If your baby hasn’t started drinking it in that window, refrigerate it immediately and use it within 24 hours.
There’s a stricter rule once your baby begins feeding from a bottle. Saliva introduces bacteria into the liquid, so any formula remaining in a bottle after a feeding should be discarded within 1 hour of the feeding starting. You cannot save partially consumed bottles for later, even in the refrigerator. This is one of the biggest sources of waste, so making smaller bottles and topping up if your baby is still hungry can help you stretch each can further.
Tips to Make Each Can Last Longer
The single most effective way to reduce waste is to prepare smaller bottles. If your baby usually finishes 4 ounces but sometimes stops at 3, start with 3 ounces and mix another ounce if needed. It takes an extra minute, but over a month the saved formula adds up to the equivalent of one or two full cans.
Keeping track of feeding patterns also helps. Babies tend to eat similar amounts at similar times of day once they settle into a rhythm. Paying attention to those patterns lets you prepare the right amount more consistently. And because opened powder must be used within 4 weeks, buying a container size that matches your baby’s current consumption rate prevents you from throwing away unused powder at the end of the month.