When Can Babies Eat Peanuts?
Babies can — and should — be introduced to peanut products early, around 4–6 months for high-risk babies and around 6 months for low-risk babies. The landmark LEAP study demonstrated that early introduction of peanuts reduces the risk of peanut allergy by up to 86%.
Key Takeaways
- Low-risk babies can be introduced to peanut products (smooth peanut butter thinned with water) at 6 months
- High-risk babies (severe eczema or existing egg allergy) should be introduced at 4–6 months, ideally after allergy testing
- The LEAP study (NEJM, 2015) showed early introduction reduces peanut allergy risk by 86% compared to avoidance
- Whole peanuts are a choking hazard for children under 5 — always use smooth peanut butter or peanut powder
- After a successful introduction, offer peanut products 3 times per week to maintain tolerance
The Evidence: Why Early Introduction Matters
The LEAP (Learning Early About Peanut) study (NEJM, 2015) changed global allergy guidelines:
- 640 high-risk infants randomized to early peanut consumption vs. avoidance
- Early consumption group: 3.2% developed peanut allergy
- Avoidance group: 17.2% developed peanut allergy
- Conclusion: Early introduction is highly protective
When to Introduce Peanuts: Risk Stratification
| Risk Level | Definition | Recommendation |
|---|---|---|
| High risk | Severe eczema AND/OR existing egg allergy | Introduce at 4–6 months, consult allergist first |
| Moderate risk | Mild/moderate eczema | Introduce at 6 months, after other solids |
| Low risk | No eczema, no food allergy | Introduce at 6 months with other solids |
How to Introduce Peanuts Safely
Age-Appropriate Forms (Never Whole Peanuts Under 5)
6 months + (purée stage):
- 1 tsp smooth peanut butter + 2–3 tsp warm water = smooth paste
- Mix into fruit or vegetable purée
8–10 months (soft textures):
- Thinned peanut butter on toast fingers
- Peanut powder mixed into porridge
12+ months:
- Smooth peanut butter on toast
- Peanut butter blended into smoothies
First Introduction Protocol
- Make sure your baby is healthy (no current illness)
- Offer in the morning at home (not daycare or restaurant)
- Start with a very small amount (1/8 tsp) on a spoon
- Wait 15–30 minutes and observe
- If no reaction after 30 minutes, offer the remaining portion
- Give peanut 3 times per week to maintain tolerance
Signs of Peanut Allergy
Watch for reactions within 2 hours of eating:
Mild reactions:
- Hives (red, itchy, raised bumps)
- Mild swelling around mouth
- Runny nose
Severe (anaphylaxis, call emergency services immediately):
- Difficulty breathing or wheezing
- Swelling of tongue, lips, face
- Vomiting and abdominal pain together with other symptoms
- Sudden extreme pallor or floppiness
After a Successful Introduction
Continue offering peanut products 3× per week. Studies show tolerance must be maintained with regular exposure, stopping after introduction can allow allergy to develop.
🔗 Track allergen introduction with our Allergy Tracker.
Sources: LEAP Study. Du Toit et al., NEJM 2015; American Academy of Pediatrics (AAP). Peanut Introduction Guidelines 2019; NHS UK. Food Allergies in Babies; ASCIA. Introduction of Allergenic Foods
Frequently Asked Questions
When can babies eat peanuts?
Low-risk babies can be introduced to peanut products — smooth peanut butter thinned with water, or peanut puffs — around 6 months. High-risk babies (severe eczema or existing egg allergy) should be introduced at 4–6 months, ideally after consulting an allergist. Whole peanuts are a choking hazard and must never be given to children under 5.
How do I introduce peanuts to my baby for the first time?
Mix 1 teaspoon of smooth peanut butter with 2–3 teaspoons of warm water to make a smooth paste. Give a very small amount (1/8 teaspoon) on a spoon and wait 15–30 minutes. If no reaction, offer the remaining portion. Introduce at home in the morning so you can monitor during the day.
Can early peanut introduction really prevent peanut allergy?
Yes. The LEAP study (NEJM, 2015) found that introducing peanuts to high-risk babies at 4–11 months reduced peanut allergy by 86% compared to avoidance. This evidence reversed decades of guidance that recommended delaying allergenic foods.
What does a peanut allergy reaction look like in babies?
Mild reactions include hives (red, raised bumps), mild swelling around the mouth, or a runny nose — typically within 2 hours of eating. Severe reactions (anaphylaxis) include difficulty breathing, swelling of the tongue or face, sudden pallor, and vomiting with other symptoms. Anaphylaxis is a medical emergency — call emergency services immediately.
Do I need to keep giving peanut products regularly after introduction?
Yes. Studies show tolerance must be maintained with regular exposure. The AAP recommends offering peanut products 3 times per week to maintain the tolerance established at introduction. Stopping after a successful introduction can allow allergy to develop.
Sources
- AAP — Infant and toddler nutrition guidelines
- WHO — Global infant feeding recommendations
- CDC — Infant and toddler nutrition resources
🔧 Helpful Tools
- Baby Food Guide — Safe foods and introduction schedule for your baby
- Breastfeeding Tracker — Log feeds, track supply, and monitor nursing sessions
- All Baby Tools — Browse all free tools for pregnancy and baby care
📖 Related Articles
- When Can Babies Eat Eggs? — Babies can eat eggs from around 6 months when starting solids. Current AAP guidelines actually recommend introducing eggs early to prevent egg allergy.
