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Baby handbook

Introducing allergens

Feeding5 min read

What the 2017 peanut guidelines actually say, and how to offer egg and other allergens safely.

For years, families were told to delay peanut, egg, and other common allergens. That advice has been retired. Large studies found that waiting did not prevent allergy, and that introducing peanut early, and keeping it in the diet, lowered the chance of peanut allergy in babies at higher risk. The document clinicians still quote is the 2017 addendum from the National Institute of Allergy and Infectious Diseases.

What the NIAID addendum says about peanut

The addendum sorts babies into three groups. It is about peanut specifically, not a blanket rule for every food.

Baby’s history What the guideline suggests
Severe eczema, egg allergy, or both Talk with the clinician before peanut. Some babies are tested or introduced in the office. Peanut-containing food may start as early as 4 to 6 months.
Mild to moderate eczema Introduce peanut-containing foods around 6 months, at home, in a safe form.
No eczema and no food allergy Introduce peanut freely, along with other solids, in keeping with family preference.

Severe eczema means widespread, persistent rash that is hard to control, not a dry patch on the cheeks that comes and goes. If you are unsure which row you are in, that question is worth a visit or a message to the pediatrician before the first taste of peanut. Do not use a home test kit as a substitute for that conversation.

The LEAP trial, published in 2015, is the study behind the shift. High-risk infants who ate peanut regularly were much less likely to develop peanut allergy by age 5 than infants who avoided it. The guideline’s point is not a single brave spoonful. It is regular exposure, on the order of a few times a week, once the food is tolerated.

A form that is not a choking hazard

Whole peanuts, globs of peanut butter, and chunky nut spreads are choking hazards. Infant-safe options:

  • Smooth peanut butter thinned with breast milk, formula, or water until it streaks off a spoon
  • Peanut flour or peanut powder stirred into a puree or yogurt
  • A peanut puff snack made for babies, if the ingredient list is actually peanut

Offer a small amount on the tongue, wait 10 minutes, and watch. If nothing happens, you can offer the rest of a baby-sized portion. Stay in the room. Most reactions show up within minutes to two hours. A rash around the mouth from acidic fruit is not the same as hives spreading on the body. Hives, vomiting, coughing, wheezing, or sudden paleness need urgent care. Call emergency services for trouble breathing, swelling of the tongue or lips, or a baby who becomes limp.

Egg and the other common allergens

The 2017 NIAID addendum does not give the same three-row table for egg, milk, wheat, soy, sesame, fish, shellfish, or tree nuts. Broader research, including the EAT study, and later AAP guidance, support not delaying those foods once your baby is ready for solids. A practical order many clinicians are comfortable with:

  1. A food your family eats and your baby can gum, such as a vegetable or iron-rich puree.
  2. Peanut, in a thin form, once you know which risk group you are in.
  3. Well-cooked egg, such as a hard mash of scrambled egg, not a runny yolk if you are avoiding undercooked egg.
  4. Other allergens one at a time, a couple of days apart, so you can tell what caused a rash if one appears.

Yogurt and cheese can come before a cup of cow’s milk. Cow’s milk as the main drink still waits until about 12 months. Fish should be fully cooked and boneless. Tree-nut butters get the same thinning treatment as peanut butter. Sesame might be a thin tahini stirred into a familiar food.

Once a food is tolerated, keep it in the rotation. A single exposure that is never repeated does not match what the prevention trials did. A smear of peanut twice a week is more useful than a large serving once and then never again.

What early introduction does not do

It does not guarantee that your baby will never have a food allergy. It lowers risk. It also does not mean you should rub food on the skin as a test. Skin contact can irritate and is not how clinicians screen. And it does not replace eczema care. Controlling inflamed skin, with the plan your clinician gave you, is part of looking after a baby who is at higher risk.

Babies who already had a convincing reaction to a food, with hives, vomiting, or breathing changes, should not be retrialed at home. That is an allergy-clinic conversation. The same is true if a sibling has a severe food allergy and you are unsure how to start. Ask.

A calm first afternoon

Pick a day when you will be home for two hours, not on the way to day care. Offer the new food early in the day so any question comes up before bedtime. Keep the rest of the meal familiar. Write down what you offered and how much, which is exactly what a baby tracker is good for. If the afternoon is boring, that is the result you wanted.

Sources

This guide is general information for families, not medical advice, and it is not a substitute for your pediatrician.

This Baby handbook page is general information, not medical advice. When in doubt, call your pediatrician.