Food Allergy Prevention: Introduce Early, Not Late

The LEAP Study Changed Everything

For decades, parents were advised to delay introducing allergenic foods to reduce allergy risk. Then came the LEAP (Learning Early About Peanut Allergy) trial in 2015: high-risk infants who were introduced to peanuts between 4–11 months had an 70–80% lower rate of peanut allergy by age 5 compared to those who avoided peanuts (Du Toit et al., 2015).

The updated AAP guidelines now recommend introducing allergenic foods around 4–6 months, alongside other solids. Delaying does not reduce allergy risk — it may increase it. This evidence-based shift is a good example of how modern parenting means following updated research rather than inherited advice.

The 8 Major Allergens

These foods account for the vast majority of childhood food allergies:

• Cow's milk and dairy
• Eggs
• Peanuts
• Tree nuts (walnuts, almonds, cashews)
• Wheat (gluten)
• Soy
• Fish and shellfish
• Sesame

How to Introduce Allergenic Foods Safely

• One at a time: Introduce each new allergenic food on a separate day, 3–5 days apart — so you can identify the culprit if a reaction occurs.
• During the day: Give new foods in the morning or at lunch, not the evening. If a reaction happens, you'll be able to reach medical care more easily.
• Start small: A small amount first, then watch for 15–30 minutes before giving more.
• Consult before introducing if eczema is severe: Babies with significant eczema may benefit from allergy testing before peanut introduction.

Recognizing an Allergic Reaction

Mild: hives, redness, swelling of lips. Moderate: vomiting, diarrhea, widespread urticaria. Severe (anaphylaxis): difficulty breathing, wheezing, facial swelling, loss of consciousness — call emergency services immediately.