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Is It Harmful to a Baby to Keep Changing Formulas?

While it is not necessarily harmful long-term to a baby to keep changing formulas, it could result in gastrointestinal distress, says Dr. Jane Scott, Colorado-based pediatrician and neonatologist. It’s best not to change formulas frequently — especially if your child is tolerating a particular one well — because babies can experience gas, diarrhea, constipation or vomiting while adjusting to a new formula, says Scott. “If they are having difficulty tolerating a particular formula, such as lots of gas or spitting up, it is good to try a lactose-free formula,” she says. If it is necessary to change the formula, give your child two to three weeks on one formula to allow his body to adjust and adapt.

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