How to Safely Introduce Peanut and Other Allergens to Babies

What you need to know

• The LEAP study found an 81% relative reduction in peanut allergy when an infant-safe form of peanut was introduced early (4–11 months) and eaten regularly through age 5.
• High risk: babies with severe eczema, egg allergy, or both should be evaluated by a clinician, often with a blood or skin prick test, before introducing peanut, typically between 4 and 6 months if testing supports it.
• Moderate risk: babies with mild-to-moderate eczema can typically have peanut introduced around 6 months, at home or in a clinician's office.
• Low risk: babies without eczema or egg allergy can have peanut-containing foods introduced along with other solid foods, according to family preference.
• Peanut should never be given as a whole nut or a thick spoonful of peanut butter to an infant, both because of choking risk and because a large first exposure isn't the recommended approach.
• A baby who is already allergic to peanut should not be given peanut foods; testing helps clarify this before introduction in higher-risk infants.

Why Early Introduction Matters

For years, families were often advised to delay allergenic foods, but that guidance changed after the LEAP (Learning Early About Peanut allergy) study, which found that introducing peanut early and keeping it in a baby's diet regularly was linked to a substantially lower rate of peanut allergy by age 5 compared with avoidance. Based on this and related research, the National Institute of Allergy and Infectious Diseases (NIAID) published addendum guidelines in 2017, endorsed by the American Academy of Pediatrics, organizing recommendations by a baby's individual risk level rather than a single one-size-fits-all rule.

Risk Categories and Recommended Timing

These categories and ages are general clinical guidance; your pediatrician can help place your baby in the right category and advise on timing, especially if your baby has other health conditions.

How to Introduce Peanut Safely

• Never give a whole peanut, peanut pieces, or a thick spoonful of peanut butter directly — these are choking hazards for infants
• Thin smooth peanut butter with warm water or breast milk/formula to a runny consistency, or use a small amount mixed into a puree your baby already eats
• Age-appropriate peanut puffs designed for infants are another commonly used option
• Introduce one new allergenic food at a time, and wait a few days before introducing the next, so you can identify a reaction if one occurs
• Once introduced and tolerated, keep peanut in your baby's diet regularly — the LEAP study's protective effect was tied to regular, ongoing exposure, not a single taste

Other Common Allergens

The same general logic — introduce early, in age-appropriate forms, and keep in the diet regularly once tolerated — is commonly discussed for other major allergens too, including egg, tree nuts, milk, soy, wheat, fish, and sesame. As with peanut, a baby with an existing allergy to one of these foods, or significant risk factors, benefits from a clinician's guidance before introduction. See our food allergies guide for a broader look at the most common allergens.

When to seek care

Practical next steps

Safe general steps

1. Identify whether your baby has eczema (and how severe) or an egg allergy to place them in the right risk category
2. For low- or moderate-risk babies, introduce peanut in an age-appropriate, thinned or puffed form
3. Introduce one new allergenic food at a time and watch for a reaction over the following hours
4. Once tolerated, keep the food in your baby's regular diet

Actions that need medical guidance

• Whether your baby needs allergy testing before introducing peanut
• Introducing peanut to a baby with severe eczema or an existing food allergy
• What to do if you suspect a reaction during or after introduction

Frequently asked questions

Sources

1. NIAID, NIH — Addendum Guidelines for the Prevention of Peanut Allergy in the United States
2. FARE (Food Allergy Research & Education) — Peanut Early Introduction Guidelines
3. American Academy of Pediatrics — Updates in Food Allergy Prevention in Children

Medical disclaimer: This guide is for general education and isn't a substitute for personalized medical advice. It doesn't provide dosing. Always talk to a qualified healthcare professional about your symptoms and treatment.

Related guides