To scoop formula correctly, dip the scoop that came with your formula can into the powder, fill it completely, then level it off by scraping the flat edge of a clean knife across the top. That single step, leveling the scoop, is the most important part of the process. A heaped scoop contains significantly more powder than a level one, which changes the concentration of the finished bottle and can affect your baby’s health.
Why Leveling the Scoop Matters
Formula is designed to deliver a precise balance of nutrients, calories, and minerals when mixed at the ratio printed on the can. A heaped or packed scoop throws that ratio off. Over-concentrated formula (too much powder) forces a baby’s immature kidneys to process excess minerals and protein, and can cause osmotic diarrhea. Research published in the Archives of Disease in Childhood found that over-concentrated infant feeds become hyperosmolar, meaning the liquid draws water into the gut instead of absorbing it, which can contribute to feed intolerance and, in severe cases, increase the risk of a dangerous bowel condition called necrotizing enterocolitis.
Under-concentrated formula (too little powder) is a problem in the other direction. Your baby gets fewer calories and nutrients per feeding, which over time can slow weight gain and leave them hungry sooner. Neither mistake is harmless, so accurate scooping is worth getting right every time.
Step by Step: Scooping and Measuring
Start with clean, dry hands and a dry scoop. Dip the scoop into the powder and let it fill naturally. Don’t press or pack the powder down. Then take a clean, flat-edged utensil, like the back of a butter knife, and sweep it straight across the rim of the scoop to remove the excess. What you’re left with is one level scoop.
Some formula cans have a built-in leveler, a flat edge on the inside of the lid designed for this purpose. If yours has one, use it. Drag the filled scoop across it in a single pass. Avoid tapping the scoop against the can or your hand, which can compact the powder and give you more than a true scoop’s worth.
Count your scoops as you add them. It sounds simple, but at 2 a.m. it’s easy to lose track. Some parents find it helpful to line up the scoops on a clean surface before adding them to the bottle, so there’s a visual count.
Always Use the Scoop From Your Formula Brand
Scoops are not interchangeable between brands. Each manufacturer sizes its scoop to match its specific mixing ratio. A scoop from one brand may be larger or smaller than another, so even if both cans say “one scoop per two ounces of water,” the actual volume of powder differs. If you switch brands, use the new scoop immediately and set the old one aside. If you lose a scoop, contact the manufacturer for a replacement rather than borrowing one from a different can.
Water First, Then Powder
Always pour the water into the bottle before adding scoops of powder. This matters for two reasons. First, it ensures you’re measuring the water accurately. If you add powder first, the powder takes up space in the bottle, and you’ll end up with less water than intended, making the formula too concentrated. Second, mixing into water helps the powder dissolve more evenly.
Follow the ratio on your specific formula’s label. Most standard infant formulas use one unpacked, level scoop per 2 fluid ounces of water, but this varies. Always check your can, especially if you’ve recently switched products.
Mixing Without Excess Bubbles
Once you’ve added the correct number of scoops, you need to dissolve the powder fully. Vigorous shaking works fast but creates foam and air bubbles, which can contribute to gas and discomfort during feeding. A gentler approach is to swirl the bottle in a circular motion rather than shaking it up and down. If you do shake the bottle, let it rest for about five minutes afterward, then give it a gentle swirl before offering it to your baby. This settling time allows most of the bubbles to rise and pop.
If you notice small clumps that won’t dissolve, swirling longer usually takes care of them. Clumps form more often when powder is added to cold water, so slightly warmer water can help with dissolving, though you’ll want to test the temperature on the inside of your wrist before feeding.
Water Temperature and Safety
Powdered infant formula is not sterile. It can harbor bacteria, including Cronobacter, a rare but serious pathogen. The CDC recommends boiling water and then waiting about five minutes before mixing it with powdered formula. At that point the water is still around 158°F (70°C), hot enough to kill harmful bacteria in the powder. After mixing, cool the bottle quickly by holding it under cold running water or placing it in a bowl of ice water until it reaches body temperature.
Keeping the Scoop Clean and Dry
Moisture is the main enemy of powdered formula. If the scoop is wet or damp when it goes into the can, it introduces moisture that can promote bacterial growth in the remaining powder. The FDA notes that powdered formula is unlikely to become contaminated as long as it stays dry. After washing the scoop, let it air dry completely before putting it back into the can.
If the scoop falls on the floor, into the sink, or touches any unclean surface, wash it the same way you’d wash a baby bottle: hot soapy water, a thorough rinse, and full air drying. Store the scoop by resting it on top of the powder inside the closed can, or keep it in a clean, dry container nearby. Avoid burying it deep in the powder where you have to dig around with your fingers to retrieve it, since that introduces additional contact and potential contamination.
Common Mistakes to Avoid
- Packing the scoop. Pressing powder into the scoop or tapping it against the counter compacts it, giving you more powder than intended.
- Eyeballing the level. A scoop that looks “close enough” can be off by 10 to 20 percent. Use a flat edge every time.
- Adding extra scoops for hunger. If your baby seems hungrier than usual, offer a larger volume of correctly mixed formula rather than adding extra powder to the same amount of water.
- Using a wet scoop. Even a few drops of water clinging to the scoop can cause clumping in the can and create an environment where bacteria can grow.
- Switching scoops between brands. Even scoops that look similar in size may differ by several milliliters, enough to meaningfully change concentration.