Most infants should be introduced to peanut-containing foods around 4 to 6 months of age, alongside other solid foods. This is a major shift from older advice that recommended waiting until age 2 or 3. The landmark LEAP trial showed that early introduction reduced peanut allergy by 81% compared to avoidance, and among families who consistently kept peanut in the diet, the reduction reached 98%. The exact timing for your baby depends on one key factor: their risk level.
How Risk Level Determines Timing
Babies fall into three groups based on whether they have eczema or an existing food allergy. The higher the risk, the earlier peanut should be introduced.
- High risk (severe eczema, egg allergy, or both): Introduce peanut foods as early as 4 to 6 months. These babies should be tested for peanut allergy first, ideally with a skin prick test or blood test. If testing shows sensitization, a specialist can help guide introduction safely.
- Moderate risk (mild to moderate eczema): Introduce peanut foods around 6 months. Testing isn’t required, though your pediatrician may recommend it depending on other factors like family history.
- Low risk (no eczema, no food allergies): Introduce peanut freely at home along with other solid foods, whenever your baby is developmentally ready for solids.
A 2021 expert panel from leading allergy organizations simplified things further, recommending that peanut and egg be introduced around 6 months for all infants, without requiring risk screening or allergy testing beforehand. In practice, both approaches point in the same direction: don’t delay.
Talk to Your Pediatrician Early
The best time to bring this up is at your baby’s 2- or 4-month checkup. That gives you and your doctor time to assess which risk group your baby falls into and decide whether allergy testing makes sense before you start. Severe eczema in infants means a persistent or frequently returning rash that needs prescription-strength creams. If your baby has had that kind of rash, or has reacted to eggs, mention it early so testing can happen before the 4-to-6-month introduction window closes.
For babies in the moderate and low risk groups, there’s no need for a doctor’s office visit specifically for the first taste. You can do it at home. Some parents feel anxious enough that they’ve reported introducing allergenic foods in emergency room parking lots. That level of worry is understandable but usually unnecessary for babies without severe eczema or egg allergy.
How to Prepare Peanut Foods Safely
Whole peanuts and spoonfuls of thick peanut butter are choking hazards for babies. The goal is to deliver about 2 grams of peanut protein in a texture your baby can handle. Here are four proven options, each providing roughly that amount:
- Peanut puffs (like Bamba): About 21 pieces. For babies under 7 months, soften with 4 to 6 teaspoons of water. Older babies who handle dissolvable textures can eat them dry.
- Thinned peanut butter: Mix 2 teaspoons of smooth peanut butter with 2 to 3 teaspoons of hot water. Stir until fully dissolved and let it cool. Add more water or infant cereal if needed.
- Peanut butter puree: Blend 2 teaspoons of smooth peanut butter into 2 to 3 tablespoons of a fruit or vegetable puree your baby already tolerates.
- Peanut flour or powder: Stir 2 teaspoons of peanut flour (or peanut butter powder) into about 2 tablespoons of pureed fruit or vegetables.
These recipes come from the NIAID guidelines and were modeled on the methods used in the clinical trials that proved early introduction works.
What the First Feeding Should Look Like
Start by offering a small amount on the tip of a spoon. Then wait 10 minutes. If your baby shows no reaction, slowly feed the rest of the portion at their normal eating pace. Do this when your baby is healthy and in a good mood, not when they’re already fussy or sick. It also helps to introduce peanut on a day when you have a couple of hours afterward to watch for any reaction, since symptoms can appear up to two hours after eating.
Your baby should already be eating some solid foods before you add peanut. The first solid food your baby tries shouldn’t be peanut, but it doesn’t need to be far behind.
Signs of an Allergic Reaction
Most babies tolerate peanut without any issues. But in the small percentage who react, symptoms typically show up within two hours and can include:
- Hives or a rash around the mouth, face, or body
- Swelling of the lips, tongue, or face
- Vomiting
- Coughing or wheezing
- A change in skin color (pale or bluish)
- Trouble breathing
- Sudden limpness or drowsiness
A few red spots around the mouth from contact with the food are common and not the same as hives. True hives are raised, swollen bumps that spread beyond the area the food touched. If you see spreading hives, vomiting, or any breathing difficulty, call 911.
Keeping Peanut in the Diet After Introduction
Introducing peanut once isn’t enough. The protective effect comes from regular, ongoing exposure. The clinical guidelines recommend feeding your baby about 2 grams of peanut protein (one serving from the options above) three times per week. This is the amount and frequency used in the trials that demonstrated the allergy prevention benefit.
You don’t need to be rigid about it. Mixing peanut butter into oatmeal, offering peanut puffs as a snack, or blending peanut powder into smoothies a few times a week all work. The key is consistency over time, not perfection on any given day. Keep it up through the first year and beyond as part of your child’s normal diet.