SafetyClinical reviewAge 4-12 monthsEvidence-based

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Safely Introducing Allergens to Your Baby: Evidence-Based Protocols

Published January 18, 2026Updated January 18, 2026Hub Safety

Bottom Line

Introduce common allergens like peanut and egg early, around 4-6 months, to reduce allergy risk. Start small and observe for reactions.

Key Takeaways

  • Early introduction (4-6 months) can reduce peanut allergy risk by 80%
  • Introduce one new allergen at a time
  • Wait 2-3 days between new allergens to watch for reactions
  • Never introduce allergens during illness

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Safely Introducing Allergens to Your Baby

Recent research (like the LEAP study) has completely changed guidelines: delaying allergens increases risk. We now recommend early introduction.

The Top 9 Allergens

These account for 90% of food allergies:

  1. Peanuts
  2. Tree Nuts (Cashew, Walnut)
  3. Egg
  4. Milk (Cow's dairy)
  5. Wheat
  6. Soy
  7. Fish
  8. Shellfish
  9. Sesame

How to Introduce Safely

1. Timing

  • Low Risk: Start around 6 months with other solids.
  • High Risk (Eczema/Egg Allergy): Consult pediatrician; may start as early as 4-6 months.

2. Method

  • Texture: Never give whole nuts or globs of nut butter (choking hazard). Thin it with water, breastmilk, or mix into oatmeal.
  • Quantity: Start small (e.g., 1/8 teaspoon). If tolerated, gradually increase.
  • Setting: Do it at home, in the morning (to observe for 2 hours).

3. The 3-Day Rule (Modified)

When introducing a top allergen, offer no other new foods for 3 days to pinpoint any reaction.

Recognizing a Reaction

  • Mild: Hives around mouth, few spots on body.
  • Severe (Anaphylaxis): Swelling of lips/tongue, difficulty breathing, vomiting, widespread hives, limpness.
  • Action: Stop feeding immediately. For severe symptoms, call 911/Emergency.

Maintenance

Once introduced and tolerated, keep the allergen in the diet regularly (e.g., 2-3 times a week) to maintain tolerance.

Frequently Asked Questions

When should I introduce peanuts?

As early as 4-6 months, after starting other solids, to reduce allergy risk.

How do I introduce peanut butter?

Mix a small amount with water, breastmilk, or oatmeal. Never give whole nut butter due to choking risk.

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💡 Note: This content is curated from official health organization guidelines. For original source citations, see the "Sources" section above.

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