When to Introduce Peanut to Infants
Introduce peanut-containing foods to infants between 4-6 months of age, with the specific timing and method determined by the infant's risk level for peanut allergy based on presence of severe eczema or egg allergy. 1
Risk-Stratified Approach
The 2017 NIAID expert panel guidelines provide a clear algorithm based on three risk categories:
High-Risk Infants (Severe Eczema and/or Egg Allergy)
For infants with severe eczema or egg allergy, introduce peanut between 4-6 months after evaluation by a specialist. 1 These infants require:
- Peanut skin prick testing (SPT) before introduction to stratify risk further
- Introduction of other solid foods first to demonstrate developmental readiness
- Specialist evaluation if SPT wheal is ≥3mm 1
Critical SPT-based decision tree:
- SPT <3mm wheal: Introduce peanut at home with ~2g peanut protein, 3 times weekly 1
- SPT 3-7mm wheal: Supervised feeding or oral food challenge in specialist's office required 1
- SPT >7mm wheal: High risk for established allergy; do not introduce without specialist clearance 1
This recommendation derives from the LEAP trial, which demonstrated an 81% relative risk reduction in peanut allergy development among high-risk infants who consumed peanut regularly 2, 3. The protective effect persists through adolescence even after periods of avoidance 4.
Moderate-Risk Infants (Mild-to-Moderate Eczema)
Introduce age-appropriate peanut-containing foods around 6 months at home without prior testing or specialist evaluation. 1 Start other solid foods first to confirm developmental readiness, then add peanut according to family preferences.
Low-Risk Infants (No Eczema, No Egg Allergy)
Introduce peanut freely after other solid foods, typically around 6 months, without restrictions. 1
Practical Implementation
Appropriate Peanut Products and Dosing
Target ~2g peanut protein per feeding, 3 times weekly (6-7g total weekly) 1. Safe options include:
- Peanut puffs (e.g., Bamba): 21 pieces softened with water for infants <7 months 1
- Thinned smooth peanut butter: 2 teaspoons dissolved in 2-3 teaspoons hot water, cooled 1
- Peanut butter mixed with pureed fruit/vegetables: 2 teaspoons peanut butter with 2-3 tablespoons puree 1
- Peanut flour/powder: 2 teaspoons mixed with pureed foods 1
Critical safety warnings:
- Never give whole peanuts to children <5 years (choking hazard) 1
- Never give peanut butter directly from spoon or in lumps to children <4 years 1
Timing Considerations
The 4-6 month window is optimal but not absolute. Infants enrolled in LEAP between 4-11 months all benefited from peanut consumption regardless of entry age 1. However, older age at screening correlates with larger SPT wheals and higher likelihood of established allergy 1. If the early window is missed due to developmental delay or other reasons, introduction can still be beneficial 1.
Well-child visits at 4-6 months provide an ideal opportunity for eczema assessment and referral if needed 1.
Breastfeeding Compatibility
Early peanut introduction does not interfere with breastfeeding. LEAP nutrition analysis confirmed that peanut introduction did not affect breastfeeding duration, frequency, growth, or overall nutrition 1. Continue breastfeeding without maternal dietary restrictions 5.
Common Pitfalls and Caveats
Mild perioral rashes (redness around mouth) during feeding may not indicate allergy and should not automatically prompt avoidance 5. The food should be offered again. However, if symptoms develop within 2 hours after a week of successful feeding, contact a healthcare provider 1.
For families with established peanut allergy in siblings or caregivers, discuss the balance between reducing infant's allergy risk versus potential accidental exposure risks to allergic family members 1.
Once introduced successfully, maintain regular consumption (~once weekly minimum) to sustain tolerance 5. The LEAP trial showed 75% of children consumed at least 6-7g weekly at 12 and 24 months 1.
International Consensus Shift
Recent guidelines globally (ASCIA 2026, international consensus 2015) consistently recommend early introduction without routine testing for most infants 5, 6. The Australian approach demonstrates that recommending early introduction without prior testing is safe and effective at increasing uptake across both high and low-risk populations 6. Testing should only be pursued through shared decision-making when specific risk factors warrant specialist evaluation 6.