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Getting the latest healthcare news for you
Breastfeeding is beneficial — but exclusively doing it for 6 months may come with a trade-off. A large Japanese study found that infants exclusively breastfed for their first 6 months had significantly higher rates of food allergy at ages 1, 2, and 3, compared to formula-fed babies — even as they showed lower rates of asthma. Boys appeared to face a greater elevated food allergy risk than girls.
Exclusive breastfeeding has long been championed for its health benefits — but a new large-scale study adds a notable caveat. Researchers analyzing data from over 88,000 mother-infant pairs in Japan found that infants exclusively breastfed for the first 6 months had significantly higher rates of food allergy at ages 1, 2, and 3, compared to those who were exclusively formula-fed.
On the flip side, exclusively breastfed infants showed meaningfully lower risks for bronchial asthma and allergic rhinoconjunctivitis — suggesting breastfeeding's relationship with allergic disease is more nuanced than previously understood. Researchers believe the elevated food allergy risk may be tied to delayed introduction of dietary diversity when solids aren't introduced alongside breast milk.
Key Takeaways:
Why it matters: These findings reinforce existing guidance that solid foods should be introduced around 4–6 months alongside breastfeeding — not after. For pediatricians and parents, the message is clear: breast milk alone for a full 6 months may inadvertently delay the dietary exposures that help prevent food allergies.
