Yes, most healthy, full-term babies can have different brands of infant formula when the products are the same suitable type. The important comparison is the exact formula, your baby’s needs and its preparation instructions. A familiar brand name does not make every product in that brand interchangeable.
I would put the two containers side by side before changing a feed. Check the age range, protein type and any prescribed feeding instructions. Ask your baby’s clinician to confirm a substitute if you are unsure, and always check first for a specialty formula or medical feeding plan.
Trouble breathing, sudden mouth or tongue swelling, or a limp or unresponsive baby needs emergency help now. Call your local emergency number. Repeated vomiting, blood in the stool, markedly reduced feeding or fewer wet diapers needs prompt medical advice, not another brand experiment.
Compare the formula, not just the name on the lid
The FDA’s guidance for parents says most babies do well with different brands, including store brands, when they are the same type. It also recommends getting help from your baby’s healthcare provider with substitutions. That is particularly useful when two front labels sound alike but the ingredient descriptions differ.
Type. Recipe. Response.
Type: Does this exact product fit your baby’s age, protein needs and medical plan?
Recipe: What does this container say about water, its own scoop, preparation and storage?
Response: Is your baby feeding comfortably, having their usual wet diapers and growing as expected?
I would answer those three questions before comparing extras printed across the front of the tub.
For example, changing from one standard cow’s-milk-based infant formula to another standard cow’s-milk-based infant formula is a different decision from replacing a prescribed amino-acid formula with a regular supermarket formula. Both containers may say “infant.” They serve different needs.
Formula marketed in the United States must meet applicable federal nutritional and safety requirements. That does not mean every recipe is identical, every scoop holds the same amount, or every formula is appropriate for every baby. I would be wary of advice that treats those as the same claim.
Which changes need extra checking?
Start with the exact product name and description, not a container’s color. Manufacturers can sell several very different formulas under one brand. These distinctions help you explain the proposed change to a pediatrician, pharmacist or WIC nutritionist.
Read the words below the brand
- Standard infant formula
- Check the same protein type and a suitable infant age range. A store-brand option can be a reasonable comparison.
- “Gentle,” “comfort” or “sensitive”
- Do not assume these names describe the same recipe across brands. Read whether protein is partially broken down and whether lactose is reduced or absent.
- Hypoallergenic or amino-acid formula
- Get an exact replacement from the clinician managing the allergy or medical condition. Ordinary “gentle” formula is not the same category.
- Premature, higher-calorie, metabolic or other prescribed feed
- Keep the individual feeding prescription in charge. Do not replace the product or change its concentration yourself.
Milk allergy involves milk protein; lactose is a sugar. A lactose-free label alone does not show that a formula is suitable for cow’s milk protein allergy. Nor is goat’s-milk formula an allergy workaround: the American Academy of Pediatrics warns against it for babies allergic to cow’s milk because the proteins can cross-react.
Partially hydrolyzed formula and extensively hydrolyzed formula are also different. “Hydrolyzed” means the protein has been broken down, but the extent matters. If your baby uses a formula for diagnosed allergy, photograph the whole current label and ask for an exact alternative. Do not trial a regular milk formula at home to see whether the allergy has gone away.
The AAP recommends iron-fortified infant formula for formula-fed or partly formula-fed babies through the first year. A toddler drink is not an infant formula substitute. In the UK, first infant formula can be used throughout the first year; the NHS says changing to follow-on formula at six months has no demonstrated benefit. Check the age wording even when the next-stage container looks almost identical.
Cost, availability and symptoms are different reasons to switch
Wanting an affordable formula you can reliably find is a practical reason to ask about an equivalent. You do not need a premium label to prove that you are feeding your baby carefully. Compare the actual suitable products and the amount each container makes, rather than the tub price alone.
If the reason is new vomiting, painful feeds, a rash or poor growth, start with the symptoms. Buying a succession of different formulas can make the feeding history harder to explain and may delay the assessment your baby needs. Take the names of the formulas, the date each started and a description of what happened to the appointment.
If the reason is a product recall, follow the recall instructions and stop using the affected product. A gradual transition is not a reason to keep feeding recalled formula. Keep enough label information to identify the product and lot, then ask your baby’s healthcare team for a suitable replacement.
Do I have to change brands gradually?
Many babies accept a suitable new formula without a staged transition. A slower change can be useful if a baby dislikes the new taste, but it is not proof that switching directly would harm their digestion. The right approach also depends on why the formula is changing.
For a healthy baby moving between appropriate routine formulas, ask the clinician who knows your baby whether to offer the new formula on its own or introduce it gradually. There is no need to invent a fixed seven-day rule for every baby. If a clinician is treating allergy or another condition, follow their plan; keeping the previous formula in the bottle may defeat the purpose of the change.
A practical taste transition uses small amounts of the new prepared liquid alongside the old prepared liquid, with the new share increasing as advised. Vermont WIC’s transition instructions specifically say to prepare the formulas separately first. Their historical brand-contract chart is not a current shopping list or an individual prescription for your baby.
If you run out of the usual formula, you cannot manufacture a gradual transition from an empty container. Ask about an appropriate available substitute. Do not stretch what remains with extra water, homemade formula or a toddler drink. If your baby needs a specialty formula and you cannot obtain it, contact their feeding team urgently before the supply runs out.
ONE FEEDING PLAN, ONE SMALL ROUTINE STEP
Keep the bottle decision clear. Make the evening simpler.
For a separate look at your ordinary evening routine, the SleepBaby.org homepage offers a free browser-based planning preview: make three choices and get one suggested starting step, with no sign-up or card.
I would write down the agreed feeding plan first. Then, if the routine itself feels hard to coordinate, choose one small household step such as making the evening caregiver handoff clearer. Keep necessary milk feeds and medical instructions in charge.
The optional paid SleepBaby.org Workshop is an online sleep guide with short lessons you can revisit and a seven-night tracker. Try the free preview first, then decide whether the separate Workshop fits what you want help with.
Neither the preview nor the Workshop chooses formula, treats allergy or feeding discomfort, or promises that changing brands will improve sleep. Symptoms and intake concerns belong with your baby’s healthcare team.
Can I put two formula brands in the same bottle?
When both products are appropriate for your baby and combining them fits the agreed transition, the safest clear household method is to prepare each one correctly in a separate clean container, then combine the prepared liquids. Keep any medical mixing prescription separate from these general instructions.
I would not use “one scoop of each” as a generic recipe. A scoop is a tool supplied for one product, not a universal measurement. The AAP notes that scoop sizes can differ even within the same brand.
- Set out one product at a time. Wash your hands, clean the preparation surface and use properly cleaned feeding equipment. Read the current container before starting.
- Make the first formula to its own directions. For powder, measure the specified safe water first, then add the specified powder using that product’s scoop. Follow the applicable water-temperature guidance below.
- Prepare the second formula separately. Its scoop, water amount or instructions may be different. Ready-to-feed formula gets no added water; liquid concentrate must be diluted according to its label.
- Combine only the prepared liquids. Use the proportions in your agreed transition plan. Cool safely before feeding if preparation involved hot water.
- Keep the earliest deadline. Note when each formula was prepared and whether either portion has already been offered to your baby. Never combine feeding leftovers for another feed.
For a simple illustration, equal amounts of two correctly prepared formulas produce an equal liquid blend. That means measuring the finished liquids, not using half a scoop from each tin or replacing part of one formula’s water with another formula. It is an explanation of the method, not a recommendation for your baby’s bottle size.
Keep each scoop with its original container according to the label’s storage instructions. Do not tip leftover powder into the new tin. Keeping the original packaging also preserves the directions, use-by date and lot number. An unlabeled tub on a counter leaves the next caregiver too much to guess.
The water instructions still matter after a brand change
Powdered formula is not sterile. Preparation advice varies by country, the baby’s health and the exact product. Re-read the directions when changing brands or moving between powder, concentrate and ready-to-feed, even if the containers look familiar.
In the US, CDC guidance calls for extra precautions for babies younger than two months, born prematurely or with weakened immune systems. For their powdered feeds, it advises boiling water, waiting about five minutes before mixing, then cooling the prepared formula safely before feeding. Ask the feeding team about ready-to-feed formula and any product-specific instructions for a higher-risk baby.
In the UK, NHS preparation guidance generally uses freshly boiled water left for no more than 30 minutes so it remains at least 70°C when mixed with powder. Some specialty formulas have different directions; get professional advice about the exact product rather than averaging two conflicting instructions.
The feeding temperature is a separate question from the preparation temperature. Formula must not be hot when your baby drinks it. Do not microwave a bottle. The FDA also advises asking about extra preparation precautions for very young babies, including those younger than three months; a new formula is a good time to confirm your baby’s plan.
A new formula does not restart the storage clock
FDA safety guidance says to refrigerate formula right away if it will not be fed immediately and use it within 24 hours. CDC’s general limits are within two hours of preparation and within one hour after feeding begins. Discard what is left after a feed. Follow a shorter product-label limit when one applies.
Older portion, earlier deadline
Suppose one untouched formula was prepared and promptly refrigerated at 8 a.m., and a second was prepared at noon. Combining them does not move the first portion’s 24-hour limit to noon the next day.
Use the earliest applicable deadline from either portion, including its preparation, refrigeration and any feeding history. If the history is unclear, make a fresh feed. Do not try to rescue an old bottle with fresh formula.
Write the opening date on each powder container and follow its label’s after-opening period. Store opened powder dry, tightly covered and out of the refrigerator. Ready-to-feed containers can have a different after-opening limit; look at that specific label rather than applying the powder rule.
What changes might you notice, and when should you call?
A baby may notice a different taste. Stool color or firmness, burping or mild gas may also change. Minnesota WIC’s guidance on changing formulas describes these possible temporary differences. That does not mean every symptom after a switch is harmless or caused by the formula.
I would watch feeding, comfort and wet diapers together. A slightly different stool in a baby otherwise feeding normally is a different situation from repeated vomiting, pain and declining intake. “They are getting used to it” should never become a reason to ignore a baby who is becoming unwell.
Stop guessing when the pattern changes
Emergency help: Breathing difficulty, sudden swelling of the mouth or tongue, or a limp or unresponsive baby. Call your local emergency number. Use prescribed epinephrine according to the baby’s emergency plan if applicable.
Prompt medical advice: Repeated vomiting, diarrhea, blood or mucus in stool, a new rash, persistent feeding pain, poor feeding or concerns about weight gain. Ask what to feed next while the symptoms are assessed.
Urgent assessment: Fewer wet diapers than usual, unusual drowsiness, a dry mouth or other signs of dehydration. A baby who is hard to wake or has breathing difficulty needs emergency help.
The NHS food-allergy guidance and dehydration guidance explain those escalation signs. If a reaction follows a formula, do not keep offering it to test your theory. Get advice about a safe next feed; this is especially important when the formula is your baby’s main source of nutrition.
You do not have to complete a transition schedule before calling. Nor do you need to diagnose milk allergy from a photo of a diaper. Photos and a short feeding history can help the clinician, but the whole baby matters more than a single stool color.
Make the plan easy for every caregiver to follow
Alternating suitable formula brands at different feeds can be workable. The practical risk is that two adults use different scoops, preparation rules or storage deadlines without realizing it. I would choose a clear plan that both can explain, rather than changing the product at each feed to chase one better nap.
The note beside the bottles
- Exact formula name and form: powder, concentrate or ready-to-feed.
- Whether it is the usual feed, a confirmed substitute or part of a clinician’s transition plan.
- Preparation time, storage history and when feeding started.
- Any symptoms, the advice received and who to contact.
Keep the original container and its own scoop available. A photograph of the front label alone leaves out the mixing directions.
At daycare, tell staff about a change before sending the first bottle and follow their labeling policy. At home, a paper note or shared phone note is enough. Record what your baby actually drank if intake is a concern, rather than assuming the amount prepared is the amount consumed.
Keep feeding responsive. Hold your baby and the bottle, allow pauses, and stop when they show they have had enough. Do not push them to finish a bottle just to make the transition chart look complete. Ask for feeding support if refusal persists or total intake drops.
Common questions about using two brands
Can I use Similac and Enfamil?
The brand names alone are not enough to answer. Each sells different formulas. Compare the exact products and your baby’s requirements using the checks above. I would send photos of both full labels to the clinician instead of asking whether two entire brands are equivalent.
Is a store brand a lower-quality choice?
A lower price does not by itself make an infant formula nutritionally unsuitable. Check the same relevant type, age range and preparation requirements. A product that is affordable and reliably available may make the feeding plan easier to maintain. Do not substitute a toddler beverage simply because its container costs less.
Should I switch because my baby has one unsettled night?
I would not judge a formula by one night’s sleep. Look first at whether your baby is feeding comfortably and getting enough milk, and seek advice for symptoms. The NHS says there is no evidence that “hungry baby” formula makes babies settle better or sleep longer. A change of brand is not a dependable sleep treatment.
What if I cannot afford or find the usual formula?
Contact your pediatrician and, in the US, your local WIC office about suitable options and available support. Bring the exact product information, especially for a prescribed feed. Do not use a recalled product, dilute formula, make homemade formula or replace infant feeds with ordinary cow’s milk or plant drinks on your own.
Can I keep changing until the gas stops?
Repeated changes make it harder to see a pattern. Ask for a review of the symptoms and feeding technique, along with whether the current formula is appropriate. Keep a brief record of feed timing, symptoms and wet diapers. That gives the appointment more to work with than a row of opened tins.
FDA video: infant formula safety tips
The FDA’s short video supports the preparation basics. Written takeaway: follow the current label, use the correct water amount and supplied scoop, refrigerate an unused prepared feed promptly, and never make homemade infant formula. It does not choose a replacement for a medically prescribed formula.
Optional preparation tool: a formula mixing pitcher
If you already prepare suitable formula ahead with safe refrigeration, the Dr. Brown’s 32-ounce Formula Mixing Pitcher is one optional tool for stirring a batch. Its manufacturer describes a mixing blade and capacity up to 32 ounces. That capacity is not a suggested feeding amount or permission to keep formula longer.
I would use it for one correctly prepared formula at a time. It does not decide whether two products are interchangeable or correct a wrong powder-to-water ratio. Follow the cleaning instructions and all formula storage limits.
Already-owned alternative: a clean bottle for preparing a feed and a written time label. You do not need a pitcher to change brands safely. No purchase is required to use this guide.
Sources View sources
- FDA: Infant formula information for parents and caregivers
- AAP: Choosing a baby formula
- NHS: Types of formula
- Vermont WIC: Transition method, 2021 (PDF)
- AAP: Product-specific scoops and mixing
- CDC: Formula preparation and storage
- NHS: Preparing powdered formula
- FDA: Infant formula safety do’s and don’ts
- Minnesota WIC: Changes to watch for (PDF)
- NHS: Food allergy and emergency signs
- NHS: Dehydration
- CDC: Responsive bottle feeding
- Vermont Department of Health: Support with formula substitutions
- Dr. Brown’s: Formula Mixing Pitcher product information
KEEP THE NEXT FEED EASY TO EXPLAIN
A clear feeding plan leaves less to guess.
Once the formula and safety questions are settled, you can explore an ordinary routine question on the SleepBaby.org homepage. The free planning preview and optional Workshop are separate from your baby’s nutrition and medical care.
