Peanut Introduction Guidelines for Infants

1. Low‑Risk Infants (No Eczema, No Food Allergy)

• Introduce smooth, thinned peanut butter (or other peanut‑containing foods) when the infant is about 6 months old (but not before 4 months) and shows developmental readiness (good head control, can sit with support, shows interest in solids). No pre‑introduction allergy testing is required, and the feeding can be performed safely at home. [National Institute of Allergy and Infectious Diseases (NIAID) – Level 1 evidence] [1][2]3

2. Moderate‑Risk Infants (Mild‑to‑Moderate Eczema)

• Peanut can be introduced around 6 months of age at home without a specialist evaluation or formal allergy testing. The infant should first have tolerated other solid foods to confirm safe swallowing. [NIAID – Moderate evidence] [1][2]3
• While routine office supervision is not mandatory, families and clinicians may choose a supervised feeding in the clinic based on comfort level. [NIAID – Expert consensus] [1][2]

3. High‑Risk Infants (Severe Eczema and/or Egg Allergy)

• Peanut introduction should occur between 4 and 6 months only after evaluation by an allergist and after appropriate allergy testing (skin‑prick test preferred over specific IgE blood testing). [NIAID – Strong recommendation] [1][2]3

4. Interpretation of Skin‑Prick Test (SPT) Results for High‑Risk Infants

5. Safe Home Introduction Protocol (Applicable to Low‑ and Moderate‑Risk Infants)

• Preparation: Feed only when the infant is healthy (no cold, vomiting, diarrhea, or other acute illness). Conduct the first feeding at home, not in daycare or a restaurant. Ensure at least one adult can focus exclusively on the infant for ≥ 2 hours after the feeding. [NIAID] 4
• Recommended Peanut‑Containing Food Forms:
• Feeding Steps: Offer a very small amount on the tip of a spoon; wait 10 minutes while observing for any reaction. If no reaction occurs, continue feeding the remainder at the infant’s usual pace. [NIAID] 4

6. Warning Signs Requiring Immediate Medical Attention

• Mild symptoms: New rash or a few hives around the mouth or face after the first exposure. [NIAID] 4

7. Timing Considerations for All Infants

• Do not delay peanut introduction beyond 6 months unless medically indicated; delaying does not prevent allergy and may increase risk. This recommendation is supported by the LEAP trial and epidemiologic data from Israel, which together provide Level 1 evidence for early introduction. [NIAID] 1
• If the optimal 4‑6 month window is missed, peanut can still be introduced up to 11 months of age, although later introduction is associated with a higher likelihood of established peanut allergy. [NIAID] 1

8. Breastfeeding Compatibility

• Continue breastfeeding while introducing peanut; the LEAP study showed that peanut introduction does not affect breastfeeding duration, frequency, infant growth, or nutrition. This aligns with exclusive breastfeeding recommendations through the first 6 months of life. [NIAID] 1

Food Allergy Testing and Introduction in High-Risk Infants

Defining High-Risk Infants and Testing Protocol

• High-risk infants, defined as those with severe eczema or egg allergy, should undergo food allergy testing between 4-6 months of age, specifically before introducing peanut-containing foods, using skin prick testing rather than serum IgE measurement, as recommended by the American Academy of Allergy, Asthma, and Immunology 5, 6, 7
• The American Academy of Pediatrics recommends that high-risk infants with severe eczema, requiring topical corticosteroids or calcineurin inhibitors for at least 12 of 30 days on two occasions, should be evaluated by an allergist before introducing peanut 5, 7
• Infants with egg allergy diagnosed in the first 4-6 months of life should also be evaluated by an allergist before introducing peanut, according to the American Academy of Allergy, Asthma, and Immunology 5, 6, 7

Testing Method and Interpretation

• Skin prick testing (SPT) is preferred over serum IgE measurement because IgE testing results in considerably higher rates of sensitization, leading to unnecessary oral food challenges, as stated by the American Academy of Allergy, Asthma, and Immunology 5, 7
• SPT should be performed with both negative and positive histamine controls, in duplicate, with the maximum wheal diameter measured, as recommended by the American Academy of Allergy, Asthma, and Immunology 5, 7
• For peanut SPT results, a wheal ≤2 mm indicates low allergy risk, 3-7 mm indicates moderate to high risk, and ≥8 mm indicates high likelihood of allergy, according to the American Academy of Allergy, Asthma, and Immunology 6

Introduction Strategy

• Infants should introduce peanut between 4-11 months of age in an age-appropriate form, with a median 7.7g peanut protein per week, to sustain tolerance, as recommended by the American Academy of Pediatrics 5, 7
• Regular consumption of peanut should be maintained to sustain tolerance, and breastfeeding should continue alongside solid food introduction, according to the American Academy of Pediatrics 5, 7
• Other allergenic foods, such as egg, dairy, and wheat, should be introduced around the same time without additional testing, as recommended by the American Academy of Allergy, Asthma, and Immunology 8, 9

Evidence and Guidelines

• The 2017 NIAID guidelines, endorsed by the American Academy of Pediatrics in 2019 and a 2021 consensus from the AAAAI, ACAAI, and Canadian Society for Allergy and Clinical Immunology, recommend early peanut introduction to reduce peanut allergy risk by up to 80% in high-risk infants, based on Level 1 evidence from the LEAP trial 8, 9, 7