How to Switch Infant Formula

Infants fed with formula milk often undergo a transition to a different brand or type of formula at some point—either partially or entirely. However, many new mothers feel uncertain and unsure about how to properly switch their baby’s formula.

How to Switch Infant Formula

If switching formula brands for a healthy, typically developing infant, the transition should be gradual. Specifically, over several feedings, gradually increase the proportion of the new formula while decreasing that of the old one. For example, if preparing one bottle normally requires four scoops of the original formula, begin by mixing three scoops of the old formula with one scoop of the new formula. Observe whether your baby accepts it and watch for any adverse reactions.

If intolerance occurs, adjust the ratio to two scoops of the old formula and two scoops of the new formula. Next, shift to one scoop of the old formula and three scoops of the new formula, and finally complete the transition to the new formula exclusively.

If no signs of intolerance appear, continue incrementally increasing the proportion of the new formula until the transition is fully complete. However, if the infant requires a specialized formula—for instance, due to cow’s milk protein allergy, necessitating a switch from standard formula to a hypoallergenic formula—the transition may be done directly, without gradual mixing. In such cases, replacing the old formula entirely with the new one from the outset is often more effective in alleviating the infant’s symptoms.

For formula-fed infants, it is essential to maintain an appropriate milk temperature during preparation—avoid serving formula that is too hot or too cold. We hope this information proves helpful!