How do I transition my baby to a new formula?

When transitioning between formulas, it is best to do so gradually to monitor for any digestive reactions. A common method is to replace a small portion of the old formula with the new one over four days: start with 25% new on day one, 50% on day two, 75% on day three, and 100% on day four. If your baby has a sensitive tummy, this phased approach helps you observe how they adjust to the new brand.