Food allergy affects an estimated 8-10% of children, and many children with food allergies are allergic to more than one food. With no known cure, prevention has become an increasingly important part of the conversation between pediatricians and families. Dr. Angela Hogan, pediatric allergist and immunologist at CHKD, recently shared updates on food allergy prevention.
For years, families were advised to delay introducing potentially allergenic foods, particularly for infants considered at high risk. Today, the evidence points in a different direction. Early, age-appropriate introduction of certain allergenic foods, particularly peanut and cooked egg, may help reduce the risk of developing a food allergy.
A Shift From Avoidance to Early Introduction
Previous guidance recommended delaying solid and allergenic foods, in some cases until 1 year of age for milk, 2 years for egg, and 3 years for peanuts. Although intended primarily for high-risk infants, these recommendations have become widely adopted.
CHKD’s current guidance supports introducing peanut and cooked egg around 6 months of age, but not before 4 months, when infants are developmentally ready, regardless of relative risk.
The evidence behind that shift is particularly strong for peanuts. The landmark LEAP trial followed 640 high-risk infants who were randomized between 4 and 11 months of age and reported an 81% relative reduction in peanut allergy among those who consumed peanut early. A subsequent systematic review found a 71% lower risk associated with introducing peanuts between 4 and 11 months.
Evidence also supports early egg introduction, although the strength of the evidence is not identical across all foods. Five randomized trials involving 1,915 infants found approximately 24 fewer cases of egg allergy per 1,000 infants with early introduction.
Current guidance is that dairy products can be introduced around 6 months of age, when a baby is developmentally ready for complementary foods.
Understanding Early-Life Risk
Food allergy risk is influenced by multiple pathways rather than a single cause. Disruption of the skin barrier associated with eczema can facilitate sensitization, while genetics and family history may contribute to vulnerability. Early-life gut dysbiosis has also been associated with increased food allergy risk, although association does not establish causation.
For pediatricians, however, a key takeaway is that higher-risk situations call for thoughtful planning, not necessarily broad screening. Dr. Hogan cautions that unnecessary testing can delay food introduction, contribute to inaccurate diagnoses, and increase costs. Routine pre-introduction testing is not required before food introduction.
Making Early Introduction Manageable for Families
Introducing allergenic foods can understandably feel intimidating to parents. Pediatricians can help by providing simple, practical guidance.
When introducing a new food, families can begin with a simple, nonallergenic food to establish that the infant is developmentally ready for solids. They can then introduce the allergenic food in a safe, non-choking form, offering a very small initial amount, and observing the infant for 30 minutes before offering more if there is no reaction. Foods should be introduced one at a time without unnecessarily long delays.
Dr. Hogan also advises against putting food on an infant's skin as a test, taking a child to an emergency department parking lot for the first exposure, or prescribing epinephrine simply as a precaution before food introduction.
Build the Conversation into Well-Child Care
Making food allergy prevention counseling a routine part of well-child care can be a practical opportunity for pediatricians.
Dr. Hogan recommends discussing allergen introduction at the 2-, 4-, 6- and 9-month visits. Egg and peanut should be introduced between 4 and 6 months when the infant is developmentally ready, and clinicians should provide families with clear and consistent education. Even when a family has passed the 4- to 6-month window, introduction can still be beneficial. Other complimentary foods including dairy products can be introduced around 6 months too.
The takeaway for providers is straightforward: early, simple, and consistent. Early introduction does not need to be overmedicalized, and consistent clinician messaging can help close the gap between the evidence and what families are doing at home. Emphasize that families should feed early and feed often. Exposure starts tolerance- consistency maintains it.
About Angela Duff Hogan, MD
This clinical update was presented by Angela Duff Hogan, MD, a CHKD specialist in allergy, asthma, and immunology, whose clinical and research interests include food allergy. Dr. Hogan is board certified by the American Board of Allergy & Immunology and the American Board of Pediatrics. She is also a founding member of the Coastal Food Allergy Support Group and serves as a key healthcare provider and director for the FARE Neighborhood Initiative, which provides educational resources and interventions focused on reducing healthcare disparities.
Her work as an educator extends regionally and nationally, and in 2023 she received the American Academy of Pediatrics Jerome Glaser Distinguished Service Award.
Key Takeaways for Pediatricians
Begin conversations about allergen introduction early and revisit them during routine well-child visits.
Introduce peanut and cooked egg early, when developmentally appropriate, rather than intentionally delaying them.
Avoid unnecessary allergy testing before food introduction.
Give families simple, practical instructions that make first exposures feel manageable.
Reassure families that introduction can still be beneficial if they have missed the early 4- to 6-month window.
Continue to feed foods frequently to maintain oral tolerance.
