Guidance on how to switch between baby formulas and navigating other feeding changes if your baby’s needs evolve.
| OCT. 12, 2026 | 5 MINUTE READ |
Most babies do well with the same primary source of nutrition throughout infancy, whether that includes, breast milk, formula, or a combination of both. While breast milk is considered the gold standard for infant nutrition, there are many reasons families may choose or need to use formula. And, at times, feeding changes may be part of the journey. While these transitions can feel unfamiliar or different from your usual routine, many babies adapt well. This guide is designed to support you through these moments so you can feel informed and confident every step of the way.
A feeding change is simply any shift in what your baby is fed due to a shift in needs. For some families, that might mean introducing formula, trying a different formula, or moving to a more specialized option.
If a change becomes necessary, know that it’s normal for there to be a short transition period as both you and your baby adjust.
For a variety of reasons, even with lactation support, a parent who has been feeding their baby breast milk might choose to introduce formula at some point in combination with or in lieu of breast milk. While breast milk remains the gold standard for infant nutrition, there are infant formulas on the market which feature ingredients like human milk oligosaccharides, designed to bring infant formula closer to the nutritional profile of breast milk.
Some babies may experience gas, fussiness, spit-up, or changes in stool. While these symptoms can be concerning, they can have many possible causes and do not always mean a feeding change is necessary. In some cases, digestive discomfort related to food sensitivity or food allergy, such as cow’s milk protein allergy, may necessitate a feeding change. In the case of food allergy, hypoallergenic formulas are scientifically developed to be easy-to-digest and nutritionally complete. Abbott's portfolio includes hypoallergenic formulas, supported by clinical research, to help families navigate a range of feeding needs.
Sometimes, your baby’s usual formula may not be readily available—whether due to changes in store stock, access challenges, or while traveling. In these moments, parents may need to choose an alternative that meets their baby’s nutrition needs. However, many babies adjust well to a new option when needed.
Before making any changes, always begin by talking to your baby’s pediatrician. They can help guide you on whether a formula switch might be appropriate, and how to switch between baby formulas based on the best option for your baby’s unique needs. This is especially important if there are suspected food allergies or sensitivities, poor or slowed growth, or persistent or worsening digestive symptoms.
Feeding recommendations are individualized; what works for one baby may not work for another.
If needed, your baby’s pediatrician will help you choose the right formula that best supports your baby’s unique needs. In general, baby formula falls into a few main categories:
Abbott’s Similac® offers a range of infant formulas designed to support babies’ growth, development, and health. They are made with high-quality ingredients and meet infants’ nutrition needs—from routine feeding to specialized nutrition.
Once you and your baby’s pediatrician have determined what feeding is best, it’s time to make the change. Follow the advice of your baby’s pediatrician for how to proceed with introducing a new formula. Some babies adjust right away, while others may take several days or even weeks to fully adapt to a new formula. Keep in mind that during the transition, it’s normal to notice changes in your baby’s stool patterns or feeding behavior. If your baby has specific medical needs or food allergies, your baby’s pediatrician may recommend an immediate switch. Contact a healthcare professional right away if your baby develops any of the following: Abdominal discomfort, a skin rash that looks like hives or eczema, vomiting, diarrhea, or difficulty breathing.
As your baby adjusts to a new formula, keep a close eye on how they’re responding. Parents can watch for:
Minor changes in tolerance are common, but persistent or severe symptoms should be discussed with your baby’s pediatrician.
Q: Will switching formula upset my baby’s tummy?
A: Every baby responds differently. Some adjust easily, while others might experience things such as gas, stool changes or fussiness. These findings are common and can be part of the normal adaptation process. If symptoms continue or seem severe, consult your baby’s pediatrician.
Q: How long does it take for babies to adjust?
A: Adjustment time varies. Some babies adapt well right away; others may take a week or more. Digestive changes can be normal. It’s important to allow enough time to evaluate how well your baby is tolerating the formula, unless a healthcare provider advises otherwise. Ongoing discomfort should be discussed with your baby’s pediatrician.
Q: Does switching mean the previous formula was not right?
A: Not necessarily. Making a feeding change is simply a part of responsive feeding and attentive care. Guidance from your baby’s pediatrician can help determine the best option for your baby.
As children grow and begin eating a wider variety of foods, there comes a time to learn when to wean baby off formula. Around your child’s first birthday, many children begin transitioning from infant formula to whole milk or another age-appropriate nutritional option, depending on individual needs. Your child’s healthcare provider can guide you through this transition, including when to make the change, how much to offer, and what type of cup to use.
While some feeding changes are anticipated, others may feel less predictable. What matters most is partnering with your baby’s pediatrician to find an approach that works best for your baby and your family. If you choose to introduce formula at any point along the way, Abbott offers a range of infant formula options to help support babies’ growth, development, and overall health.
Discover the importance of carbohydrates for infants, their role in growth and brain development, and the different types found in infant formula.
.jpg)
With about half of breast milk’s calories coming from fat—the most out of the three macronutrients—it’s clear that fat plays a vital role in infant growth and development. But it’s not only about how much fat, it’s about the kinds of fat babies need. That’s why infant formulas are carefully designed to mirror the fatty acid profile of breast milk and support babies’ needs. This article breaks down the importance of fats for babies, what kind of fats are found in infant formula, and other questions you might have about baby formula ingredients.
Links which take you out of Abbott worldwide websites are not under the control of Abbott, and Abbott is not responsible for the contents of any such site or any further links from such site. Abbott is providing these links to you only as a convenience, and the inclusion of any link does not imply endorsement of the linked site by Abbott.
The website that you have requested also may not be optimized for your screen size.