From the YummyYucky team, founded by Nancy Nash

Baby has a peanut allergy: what to do day to day

Almost everything written about babies and peanut is about introducing it. This page is for after: your baby or toddler has been diagnosed with a peanut allergy, or is being tested for one, and peanut now has to stay away from a small person who puts everything in their mouth. If you are still introducing peanut, you want how to introduce peanut, step by step instead.

What a peanut allergy means

Your child's immune system reacts to proteins in peanut as if they were harmful.¹ Reactions range from hives to anaphylaxis, a severe reaction involving more than one part of the body that can be life threatening.² The last reaction does not predict the next one, no test predicts how severe a future reaction will be, and a mild reaction does not always mean a mild allergy.²³ That is why allergists avoid calling anyone's food allergy mild or severe.⁴

If your child is still being tested: a positive skin or blood test shows the body has made antibodies to peanut, but on its own it does not prove an allergy. The most accurate test is an oral food challenge, done by an allergist in a medical setting with treatment on hand.²⁴ None of it is for home.

Peanut is a legume, like beans, peas and lentils, and most children with a peanut allergy can still eat other legumes.⁹¹ The exception is lupin, sold as lupini beans and as lupin flour in gluten-free baking and pasta. People with a peanut allergy are the most at risk of reacting to it, and US labels must name it in the ingredients but do not flag it as an allergen.¹⁰ See our lupini beans page. Peanut is not a tree nut either, though some children are allergic to both (numbers in the FAQ below).¹¹⁴

Reading labels

Peanut is one of the nine major food allergens in the US, so on packaged food the FDA regulates it must be named in plain words, in the ingredient list or a "Contains" line.¹²¹³ Not every package has a "Contains" line, so read the whole ingredient list, every time you buy, even a product your child has eaten before: recipes change.¹³¹ If you are not sure, leave it on the shelf or call the company on the label.¹³

The names that mean peanut

These turn up on menus, imported and unlabeled food, and skin products:⁹⁵

• peanut, peanuts, peanut butter, peanut flour
• peanut sauce, satay
• arachis oil (another name for peanut oil)
• cold-pressed, expelled or extruded peanut oil
• groundnuts, goober nuts, monkey nuts
• beer nuts, mixed nuts
• nutmeat
• peanut brittle
• peanut sprouts
• mandelonas (peanuts soaked in almond flavoring)

Where peanut hides

What the label law does not cover

• Meat, poultry and some egg products (USDA, not FDA) and most alcoholic drinks.³⁴
• Skin products. Creams, moisturizers and shampoos can contain peanut oil as arachis oil, sodium peanutate or peanutamide.⁹⁴
• Food wrapped to order, like a sandwich wrapped at the counter. Labeling on unpackaged food, like a bagel from a bin, can vary too, so ask.¹²¹³
• "May contain" lines. They are voluntary, not every company uses them, and nothing sets what they mean.¹²¹³⁴ Whether to avoid them, and highly refined peanut oil (which the law exempts from allergen labeling¹⁵), is in the FAQ below.

Keeping peanut out at home

Whether peanut stays in the house at all is worth deciding with your allergist. If it does:

• Store it apart from your child's food, and use clean utensils, plates, pans and serving dishes so nothing gets mixed in.¹
• Make your child's food first, with its own space and equipment.¹⁶
• Clean surfaces with soap and water or a household cleaner, and wash hands with soap and water. Water alone and gel hand sanitizer do not remove food allergens.¹⁶⁴
• If a younger sibling eats peanut, ASCIA suggests a highchair, washing their hands and face (and yours) afterward, a separate washcloth for spills, and washing dishes in warm soapy water.¹⁷

Daycare, sitters and family

Give daycare a note from your child's doctor confirming the diagnosis, a written plan from the doctor saying what to do if your child reacts, and the epinephrine your child has been prescribed. The CDC points out the plan may be the only information staff have, and that keeping the epinephrine within quick reach and training staff to use it is the program's job.¹⁶¹ Then ask:

• How are hands and tables cleaned? The CDC recommends soap and water for hands and cleaning tables before and after meals.¹⁶
• What happens at snack time? Shared eating areas and toys pick up food more easily with very young children, and some programs ask every family not to send nuts.¹¹ A ban cannot promise no peanut ever gets in, so it does not replace the plan.¹⁶
• Will they call you after any contact with peanut, even with no reaction, and what is the plan for outings? The CDC recommends both, and an ambulance any time epinephrine is given.¹⁶

The same written plan goes to grandparents, sitters and friends' houses.¹ Show every caregiver the auto-injector, and ask what is in anything someone else has cooked.¹⁸¹⁹ Our feeding guide for grandparents and nannies covers the rest of the handover.

Eating out, and flying

Restaurant food has no label, and ASCIA counts it as a higher risk than a packaged food with a "may contain" warning.⁹

• Call ahead, and tell the staff again when you arrive.¹¹
• Talk to the chef or someone who knows the ingredients and how the food is made. Servers may not know everything in every dish.⁴¹
• Ask about the dish, not the menu: sauces, dips and gravies can contain peanut without saying so, and some kitchens cook in peanut oil.¹¹
• Ask for surfaces, pans and utensils that have not touched peanut. A chef card naming the allergy saves explaining it at every table.⁴

On planes, ACAAI says most reactions probably come from touching peanut dust on tray tables, and wiping surfaces down meant fewer reported reactions.⁴ Pack wipes, and keep the epinephrine and the plan with you.¹¹

Keeping the rest of the menu open

For most people, leaving peanut out does not affect nutrition or growth.¹¹ The thing to watch is cutting out more than you need to, because avoiding foods unnecessarily can affect nutrition.² For the other big 9 allergens, ASCIA's advice for a baby who already has a food allergy is to keep introducing the ones they have not had yet, and the AAP says that after an immediate reaction to any food, talk with your child's doctor first about how and when.¹⁷²⁰ So ask the allergist which comes next. The allergens your child already eats without trouble stay in the diet, regularly.²⁰¹⁷ See how often to keep offering allergens.

Children with a food allergy should get nutrition advice and regular growth checks, and ASCIA recommends an allergy dietitian for babies allergic to several foods.²¹⁷ If peanut is not the only food that is out, ask for a referral.

Being ready for a reaction

Your allergist should give you a written plan saying which signs mean what, and when to use epinephrine. Keep it with the medicine.⁴¹¹

Call 911 (or your local emergency number) right away if any of these show up soon after a food, on their own or together:

• Swelling of the lips, face, eyes, or tongue
• Swelling or tightness in the throat, or trouble swallowing
• Vomiting
• Hives that spread beyond the mouth and face
• Trouble breathing, noisy breathing, or wheezing
• A cough that keeps going
• A hoarse voice
• Skin or lips that turn pale or blue
• A baby who goes floppy or limp, or is suddenly sleepy or hard to wake

If your child has been prescribed epinephrine, give it first, as their plan says, and then call 911.¹² Giving it early matters: delays in giving epinephrine have been linked to deaths from anaphylaxis, and an antihistamine or an inhaler cannot be relied on instead.²¹

Babies cannot tell you their mouth feels strange. The AAP lists signs of a reaction seen in babies: rubbing their eyes, sticking their tongue out again and again, crying hard, arching their back, and going floppy.¹ If anything else about your baby worries you, call 911. Where allergy guidance differs, we follow NIAID’s guidance for babies, the most cautious.²¹²²¹⁸

• Keep two doses with your child everywhere. The AAP says anyone who has had an allergic reaction to food should, and a second dose is sometimes needed.¹⁴¹⁸
• Put the expiry dates in your calendar, replace the devices before they run out, and keep them out of the fridge and the hot sun.⁴¹⁸
• Practice with a trainer device (no needle, no medicine), and teach everyone who looks after your child.¹⁸²
• A medical ID bracelet tells other people about the allergy when you are not there.¹¹⁸

Questions to bring to the allergist

Write these down before the appointment.

1. What exactly did the tests show, and do we need a food challenge?
2. Can you write our plan for a reaction and show us the epinephrine: which device, which dose for my child's size, how many to carry, and exactly when to use it?⁴²
3. Should my child avoid tree nuts? Which ones, and should any be tested?
4. Do we avoid "may contain" foods, and highly refined peanut oil?
5. Which other allergens should we introduce next, and how?
6. Should we see a dietitian?
7. Is any treatment an option for my child, and from what age?
8. When will you retest, and how will we know if it is fading? Follow-up testing is how an allergist decides whether a food can come back.²
9. What about a younger sibling? A family history is a reason to check with your pediatrician before introducing peanut, and ASCIA says it is still important to introduce it.¹¹⁷

Related reading

• How to introduce peanut, step by step
• Signs of a food allergy in babies
• Living with an egg allergy
• Living with a milk allergy

Frequently asked questions

Sources

1. American Academy of Pediatrics (HealthyChildren.org): Food Allergies in Children
2. NIAID: Guidelines for the Diagnosis and Management of Food Allergy, Summary for Patients, Families, and Caregivers
3. FDA: Food Allergies: What You Need to Know
4. American College of Allergy, Asthma and Immunology (ACAAI): Food Allergies
5. FARE: Peanut Allergy
6. NIAID: Oral Immunotherapy Induces Remission of Peanut Allergy in Some Young Children (how common peanut allergy is in US children)
7. Gupta RS, et al. The Public Health Impact of Parent-Reported Childhood Food Allergies in the United States (Pediatrics, 2018)
8. ASCIA: Food Allergy Frequently Asked Questions
9. ASCIA: Dietary Avoidance for Food Allergy, Peanut
10. FDA: Lupin and Allergenicity, Frequently Asked Questions
11. ASCIA: Peanut, Tree Nut and Seed Allergy
12. FDA: Food Allergies (the nine major food allergens and how they are labeled)
13. FDA: Have Food Allergies? Read the Label
14. American Academy of Pediatrics (HealthyChildren.org): Managing Food Allergies at School: Information for Families
15. FDA: Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA)
16. CDC: Voluntary Guidelines for Managing Food Allergies in Schools and Early Care and Education Programs
17. ASCIA: How to Introduce Solid Foods to Babies for Allergy Prevention
18. NHS: Anaphylaxis
19. American Academy of Allergy, Asthma and Immunology (AAAAI): Food Allergy
20. American Academy of Pediatrics (HealthyChildren.org): When to Introduce Egg, Peanut Butter and Other Common Food Allergens (2025)
21. NIAID Addendum Guidelines, Appendix D: Instructions for Home Feeding of Peanut Protein
22. ASCIA: Anaphylaxis
23. McWilliam V, et al. Patterns of tree nut sensitization and allergy in the first 6 years of life in a population-based cohort (J Allergy Clin Immunol, 2019)

Last updated September 2026. Next review December 2026. How we write these: built from current published guidance from the AAP, CDC, FDA/EPA, NIAID, WHO, and other pediatric and public-health authorities, with sources cited on the page. See our editorial and medical policy for how we research, source, and update these, and how we double-check the food advice.

This is general information, not medical advice, and is not individualized for your baby. Always talk to your pediatrician about your baby's diet, introducing allergens, and any reaction. In an emergency, contact emergency services.

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