Published on:
Selected sources checked: November 7, 2026
Quick Answer
Start introducing allergens to your baby when your child is ready for solid foods, usually around six months. Offer one new common allergen at a meal, in a small amount and a safe texture. Include well-cooked egg and smooth, thinned peanut foods early. Keep tolerated allergens in regular meals. Ask a clinician about babies with severe eczema, known allergies or previous reactions.
Peanut, egg and milk may feel like foods to avoid, yet delaying them is usually not a good allergy prevention plan. Current guidance supports feeding common allergens during the first year once a baby can safely eat solids. There is no need to finish every fruit and vegetable before beginning. The key is choosing suitable food forms and knowing how to respond to symptoms. ASCIA's 2026 infant feeding guidance and the NHS feeding advice explain the approach.
Emergency safety: If your baby has trouble breathing, sudden swelling of the tongue or throat, becomes pale or blue, collapses, or is unusually floppy or unresponsive after eating, call your local emergency number immediately. Follow an existing prescribed allergy action plan, including using prescribed adrenaline (epinephrine) if directed. Do not wait to see whether symptoms fade. A new rash, swelling, repeated vomiting or another suspected reaction also calls for prompt medical advice, even if breathing is normal. NHS: food allergy symptoms and urgent care.
This article is for general information and education. It does not replace medical advice, diagnosis, or treatment.
Table of Contents
- When to Start Introducing Allergens
- Which Babies Need a Different Plan?
- 9 Common Allergens and Safe First Servings
- A Step-by-Step First Foods Routine
- What Reactions Look Like
- Keeping Tolerated Foods in the Diet
- Common Mistakes and Better Choices
- Special Situations and Practical Questions
- Conclusion
- References and Sources
- Related Guides
- About the Author
- Frequently Asked Questions
When to Start Introducing Allergens
Most babies start solid foods at about six months, when they have the body control and interest needed to eat. Look for a baby who can sit with support, hold the head steady, coordinate reaching and swallowing, and move food toward the back of the mouth rather than pushing it all straight out. These signs matter more than reaching an exact birthday. Do not start solids before four months. If your baby was born early or has feeding or swallowing problems, ask the healthcare team for a readiness plan.
Allergenic foods do not need a special late start. In fact, the strongest prevention evidence is for peanut and egg. The updated 2026 Australian and New Zealand ASCIA guideline recommends well-cooked egg and infant-safe peanut soon after solids begin, with the other common allergens in the first year. In the United Kingdom, the NHS generally describes starting around six months. U.S. guidance makes room for selected higher-risk babies to receive peanut foods at four to six months after appropriate evaluation and when ready. These differences reflect local guidance and risk groups, not a reason to force solids on an unready baby.
Breast milk or infant formula still supplies much of a baby's nutrition as solids begin. Keep normal milk feeds and respond to your baby's hunger and fullness cues. Food introduction should be an addition to feeding, not a race to replace milk. If your baby is just starting solids, our baby weaning foods guide covers textures, mealtime routines and wider nutrition needs.
Why early exposure matters
Research changed older advice that told parents to keep peanut and other allergens away for several years. Trials of introducing peanut and egg early found that regular eating can reduce the chance of developing some allergies, especially peanut allergy. This does not guarantee an individual baby will never develop an allergy, and it does not mean every food has equally strong evidence. The goal is normal, safe eating rather than an allergy challenge carried out at home.
Which Babies Need a Different Plan?
For a baby who has no known food allergy and is developmentally ready, many allergens can be introduced at home in safe forms. A baby with severe eczema, a diagnosed food allergy, or a suspected prior reaction needs more individual advice. An allergist or pediatrician can decide whether a first peanut serving should happen at home or in a clinical setting.
| Baby's situation | Suggested next step | Important note |
|---|---|---|
| No known allergy or eczema | Begin with safe forms after solids readiness. | Start small and introduce one new allergen at a meal. |
| Mild or moderate eczema | Discuss eczema care and food introduction at routine visits. | Do not delay peanut unnecessarily; local guidance varies. |
| Severe eczema or known egg allergy | Speak with a clinician about an early peanut plan. | Testing or supervised feeding may be considered based on individual risk. |
| Known allergy to a food | Follow the treating clinician's advice for that food. | Do not intentionally retry a diagnosed trigger at home. |
| Previous suspected reaction | Pause that food and seek clinical assessment. | Do not assume a later dose will be harmless. |
There is a genuine difference among professional recommendations about screening before peanut. The 2017 U.S. NIAID addendum recommends strongly considering peanut allergy evaluation for babies with severe eczema or egg allergy. Later U.S. allergy consensus guidance says routine screening is not required for all infants, including high-risk infants, though some families may prefer it. The practical choice should be made with your baby's clinician rather than using a blanket test-everyone or test-no-one rule. Read the NIAID guidance and the AAAAI explanation of later consensus.
A family history of allergy is worth mentioning to your healthcare professional, but it does not automatically mean your child is allergic or needs broad blood tests. Food allergy panels can give misleading positives when used without a relevant history. Do not avoid a wide group of nutritious foods solely because a relative has an allergy.
9 Common Allergens and Safe First Servings
These nine groups reflect common allergens discussed in major English-language guidance. They are not the only foods that can cause allergy, and food-label rules differ by country. For a first serving, use a food with only the new allergen plus ingredients your baby already tolerates whenever possible. The point is to make it easier to notice which food may be responsible for a reaction.
| Allergen | First serving idea | What to avoid |
|---|---|---|
| 1. Peanut | Smooth peanut butter thinned thoroughly into a familiar purée or warm water, then cooled. | Whole peanuts, thick spoonfuls of nut butter and hard nut pieces. |
| 2. Egg | Fully cooked egg, finely mashed with a familiar soft food. | Raw or undercooked egg and rubbery chunks difficult to manage. |
| 3. Cow's milk dairy | Plain pasteurised yoghurt or a little cow's milk stirred into food. | Using cow's milk as the main drink before 12 months. |
| 4. Wheat | Very soft cooked wheat pasta or smooth wheat cereal with a familiar liquid. | Dry, hard pieces or a mixed baked product containing several new allergens. |
| 5. Soy | Soft tofu mashed into a familiar purée. | Large, firm pieces and high-salt soy sauces as a starter food. |
| 6. Sesame | Well-mixed, thinned smooth tahini in a familiar purée. | Sticky thick paste and unsuitable whole-seed textures. |
| 7. Tree nuts | One named nut at a time as a finely ground powder or fully thinned smooth butter. | Whole nuts and mixed-nut butter for a first test of individual nuts. |
| 8. Fish | Fully cooked low-mercury fish, carefully deboned and mashed. | Bones, raw fish and high-mercury species. |
| 9. Shellfish | Thoroughly cooked shellfish, finely chopped or puréed to a safe texture. | Raw shellfish and tough, chewy pieces. |
Peanut and tree nuts are different allergens. Tolerating peanut does not prove your baby can eat almond, cashew or walnut. Different tree nuts can also be separate allergy triggers. Introduce individual foods carefully rather than making a mixed nut blend the first exposure. Similarly, fish and shellfish are different groups.
When a packaged food is used, read its ingredients every time. A cereal, bread, sauce or yoghurt might contain another new allergen. Food labels and precautionary statements vary between countries, so ask a qualified professional if a food is hard to identify. Do not use honey before 12 months, even in an allergen recipe, because of infant botulism risk. Always seat a baby upright and stay with them while eating.
Safe peanut preparation
Peanut butter should not be offered as a thick lump. Mix a small amount of smooth peanut butter with enough warm water or an already tolerated soft food to make a thin, smooth mixture, and allow it to cool. Check that no sticky clumps remain. If the baby has severe eczema, egg allergy or previous symptoms, obtain their clinician's guidance before the first peanut serving. Never use whole peanuts for a baby.
Egg is best well cooked
For an easy first try, cook the white and yolk fully and mash a small portion with familiar vegetables or other safe food. Some countries permit specific pasteurised or quality-marked eggs in less cooked forms, but fully cooked egg is a simple, broadly practical starter. An egg-free diet is not needed unless there is an established reason to avoid it.
Dairy is a food, not the main drink
Around six months, plain full-fat pasteurised yoghurt or cow's milk used as an ingredient can help introduce dairy. This is different from replacing breast milk or infant formula with cow's milk as the main drink. The NHS recommends waiting until 12 months before making cow's milk the main drink. If your baby has a diagnosed cow's milk protein allergy, do not try yoghurt or milk to test whether it has gone away without medical direction.
A Step-by-Step First Foods Routine
Parents often ask for a strict calendar: peanut Monday, egg Tuesday, milk Wednesday. Such a timetable is not required by the guidance. A flexible routine is more useful than a plan that pushes a family to feed a new allergen when the baby is ill, very tired or not ready to eat. Think of introduction as a series of calm meals.
Step 1: Pick a normal, calm time
Choose a day when your baby is well, awake and interested in food. Earlier in the day often makes it easier to observe them and seek advice if needed. Have a responsible adult present and know your local emergency number. Do not offer the first allergen on a day when the baby already has troubling unexplained symptoms.
Step 2: Choose a familiar base
If your baby already eats mashed vegetables or a simple cereal without problems, use that as the base for the new allergen. Avoid a meal that introduces three or four unfamiliar ingredients at once. A simple recipe helps you recognise possible reactions and makes new tastes less overwhelming.
Step 3: Start with a small taste
Offer a small amount of the new food in an appropriate texture, and check your baby is swallowing comfortably. If there is no reaction, the amount can be increased gradually according to appetite and relevant clinical guidance. Never force a baby to finish a set amount. Specific medical introduction protocols, including measured peanut doses, should be followed only when advised for your baby's situation.
Step 4: Watch for symptoms
Many immediate allergic reactions occur within minutes and generally within about two hours, so stay attentive during and after the meal. Some reactions can occur later, and a baby can also become unwell for reasons unrelated to food. If you notice a concerning symptom, stop feeding the suspected food, assess the baby and seek appropriate help. A baby who develops severe symptoms needs emergency services immediately.
Step 5: Repeat tolerated foods
Once a food is clearly tolerated, make it part of ordinary meals rather than treating the first taste as the end of the task. ASCIA's 2026 guidance recommends offering common allergens around once a week after introduction. You can offer them more often within a balanced diet when appropriate. Practical meals might include well-cooked egg at breakfast, smooth yoghurt with fruit or a little thinned peanut mixed into porridge.
Step 6: Introduce another allergen
Introduce only one new common allergen at a meal so you can identify a likely trigger. Some families prefer a short gap before the next new allergen, especially if symptoms are unclear. However, there is no universal need to wait three to five days after every new food when there has been no reaction. A long waiting rule for all foods can needlessly slow diet variety. Your healthcare professional may suggest a different schedule for your baby's circumstances.
| Stage | Example | Decision |
|---|---|---|
| First familiar foods | Soft vegetables or infant cereal | Check readiness and safe swallowing. |
| First common allergen | A little fully cooked egg | Watch for symptoms and repeat if tolerated. |
| Next introduction | Thinned smooth peanut mixture | Use a clinician's plan first if higher risk. |
| Additional foods | Yoghurt, wheat, sesame and others | Introduce one new allergen per meal. |
| Ongoing meals | Rotate tolerated foods across the week | Keep a varied diet without pressure. |
Illustrative example only: The stages above are not prescribed days, a guaranteed prevention schedule or an invitation to retry a suspected trigger. Some babies need specialist feeding advice. Others can move through foods at a relaxed pace once they are eating solids comfortably.
What Reactions Look Like
Possible allergy signs include hives, swelling of the lips or face, vomiting, coughing, wheezing and unusual breathing. Several symptoms together can mean a more serious reaction. Importantly, severe anaphylaxis may occur without a visible rash. Never use the absence of hives to rule out danger.
| What you notice | What to do |
|---|---|
| Trouble breathing, throat or tongue swelling, collapse, unusual floppiness | Call local emergency services immediately; follow a prescribed anaphylaxis plan and use prescribed adrenaline as directed. |
| New widespread hives, facial swelling, repeated vomiting or concerning cough | Stop the suspected food and seek urgent medical assessment. If severe features develop, call emergency services. |
| Small patch of redness only where food touched skin | Clean gently, observe and discuss uncertainty with your clinician. A contact rash alone does not always mean food allergy. |
| Delayed eczema flare, repeated bowel problems or uncertain symptoms | Record timing and foods; seek clinical advice before excluding major food groups. |
A little redness near the mouth can be caused by direct skin contact with irritating food, not necessarily an immune allergy. ASCIA's 2026 guidance specifically addresses these mild perioral reactions. Still, a parent cannot diagnose the difference from one photograph or a simple checklist. If the redness is spreading, involves hives elsewhere or comes with any other symptom, seek medical advice promptly. If your baby has already had a concerning reaction to that food, do not deliberately retest at home without professional direction.
Choking is another emergency, but it is not the same as allergy. Choking may show as a sudden inability to cough, cry or breathe while food blocks the airway. Learn infant first aid from a qualified local training provider before starting solids. Proper textures reduce the risk, but no food preparation removes the need to supervise eating.
Keeping Tolerated Foods in the Diet
A common mistake is introducing peanut once, noting no reaction and then avoiding it for months. Prevention guidance includes continued exposure after successful introduction. Rather than counting exact bites at each meal, plan simple recipes that regularly include the foods your baby has eaten safely. For example, smooth peanut stirred into cereal, well-cooked egg mashed into vegetables and plain yoghurt with soft fruit may all fit the family's usual menu.
ASCIA recommends offering common allergens at least weekly once introduced, while other international sources may describe regular intake without giving one exact frequency for every food. The ideal amount varies with age, appetite and the food. Do not force a serving or use a commercial allergy-prevention supplement without reviewing the evidence and safety with a clinician. Ordinary food is a practical starting point for most families.
Keep breastfeeding if you wish and it is working for your family. There is no need for a breastfeeding parent to cut peanut, egg or dairy out of their own diet solely to prevent food allergy in the infant. If a baby has an established allergy or feeding problem, the healthcare team may advise a specific nutrition plan. Avoid making wide dietary restrictions on your own because babies need adequate energy, iron and other nutrients.
What if your baby refuses the food?
Refusal is not proof of allergy. Babies make faces, spit out unfamiliar tastes and need time to learn textures. Offer the food again on another calm day in a suitable form, without force, as long as there has been no suspected allergic reaction. If feeding is consistently difficult, your baby coughs or chokes with textures, or weight gain is a concern, ask your pediatrician for assessment.
Common Mistakes and Better Choices
Waiting until toddlerhood for all allergens
Delaying peanut or egg for years is not a recommended allergy prevention method. When your baby is ready to eat and there is no individual contraindication, introduce safe forms during infancy. For babies at higher risk, ask for a plan promptly rather than simply avoiding the food until a later birthday.
Using unsafe textures
Whole nuts, thick nut butter, hard chunks and fish bones can cause choking. The correct ingredient in the wrong form is still unsafe. Thin smooth nut butters, finely grind nuts, debone fish and mash cooked foods to a texture your baby can handle. If using baby-led weaning, choose pieces appropriate for the child's actual eating skills and supervise closely.
Testing several allergens in one meal
A sandwich with peanut butter, sesame, dairy and wheat introduces several possible triggers at once. If the baby reacts, it is hard to know what caused it. Choose one new allergen at a time and pair it with familiar ingredients. After each ingredient is tolerated, combined recipes become more practical.
Trying again after a suspected allergy
A reaction to the first taste does not tell you exactly how the next exposure will go. Do not challenge a baby at home after breathing problems, swelling, significant vomiting or another concerning reaction. Ask the clinician whether testing, specialist assessment or supervised reintroduction is appropriate.
Relying on an online test or symptom photo
A photo can help document a rash for a doctor, but it cannot show breathing changes, blood pressure or the cause of a symptom. Social media symptom charts are not a diagnosis. Write down the food, amount, time and symptoms, and get appropriate help. Emergency symptoms always outrank record keeping.
Special Situations and Practical Questions
What if there is a strong family history?
A parent or sibling with allergies can raise questions, but family history does not mean every food will harm this baby. Talk with your baby's clinician about eczema, known diagnoses and any symptoms that have occurred. Avoid broad elimination diets or large screening panels without a clinical reason. If someone in the home has a serious peanut allergy, discuss how to introduce peanut without exposing that person unsafely.
What if your baby has eczema?
Eczema and food allergy can be linked, especially when eczema is severe. Keeping eczema well managed is important, and some babies will need an individual peanut plan. Seek advice early rather than postponing all allergens. Do not assume a mild eczema patch after eating proves a food allergy; ask a clinician to review the pattern and any other symptoms.
What if the baby is older than one year?
If allergens have not yet been introduced, it is not too late to discuss a safe plan. Do not interpret the first-year prevention window as a reason to give up on food variety. Age, previous reactions and other medical issues may affect the approach. With no known allergy, a healthcare professional can help address feeding worries and support gradual introduction.
Are allergy starter powders necessary?
No particular commercial food powder is required for a healthy baby to eat allergenic foods. Their ingredients, amounts and combinations vary, and products may include several allergens together. Check with the clinician before using them for a baby with risk factors. Plain foods prepared safely offer an understandable way to identify what your child is eating.
Does a tolerated taste prove lifelong safety?
No. A single symptom-free meal is useful information, not a lifelong guarantee. Continued regular feeding is part of prevention advice, and a food allergy can still be diagnosed later. If new symptoms appear after a previously tolerated food, stop and seek appropriate assessment rather than assuming the food must be safe.
Conclusion
Introducing allergens to baby is usually a steady part of starting solids, not a special test your family must rush through. Begin when your baby is ready, prioritize well-cooked egg and safe peanut foods, introduce one new common allergen at a meal and continue foods your baby tolerates. If your child has severe eczema, a known allergy or a reaction, get an individual plan. A sensible next step is choosing one suitable first food and discussing any risk factors with your baby's healthcare professional.
References and Sources
- Australasian Society of Clinical Immunology and Allergy. ASCIA Guideline: Infant Feeding for Food Allergy Prevention. Updated 2026.
- ASCIA. Updated guideline announcement. January 2026.
- National Health Service. Food allergies in babies and young children.
- National Health Service. Your baby's first solid foods.
- National Health Service. Food allergy: symptoms and when to get help.
- National Institute of Allergy and Infectious Diseases expert panel. Addendum Guidelines for Prevention of Peanut Allergy. 2017.
- American Academy of Allergy, Asthma & Immunology. Allergy testing prior to peanut introduction. 2024.
- American Academy of Pediatrics, HealthyChildren.org. When to Introduce Egg, Peanut Butter & Other Common Food Allergens to a Baby.
Related Guides
For wider first-food advice, see when to start baby weaning foods and how to serve them safely. Explore more infant feeding, health and development topics in the Parnthub Baby Care Guide. For later mealtime issues, read what to do when a toddler only wants milk.
Frequently Asked Questions
Can I introduce peanut at six months?
Yes, many babies can try peanut in a safe, thinned form when ready for solids, usually around six months. For severe eczema, egg allergy or prior symptoms, ask a clinician for an individual plan first.
Do I need to wait three days between allergens?
There is no universal three-day waiting rule for every new food. Introduce one new common allergen at a meal and watch for symptoms. Follow a different schedule if your baby's clinician recommends one.
Can I give my six-month-old peanut butter?
Use a small amount of smooth peanut butter fully thinned into familiar food or water, then cooled. Never give whole peanuts or a thick spoonful of sticky nut butter.
Should I avoid egg if my baby has eczema?
Do not automatically remove egg because of eczema. Well-cooked egg is encouraged after solids begin, but severe eczema or a history of reactions deserves individual medical guidance.
Does redness around the mouth mean food allergy?
Not always. Food touching sensitive skin may cause local redness. But spreading hives, swelling, vomiting or breathing symptoms need medical attention. Do not deliberately retry a suspected trigger without appropriate advice.
How often should I feed an allergen after it is tolerated?
Include tolerated allergens regularly in normal meals. ASCIA's 2026 guideline suggests around once a week or more, depending on the food and your baby's diet.
Can cow's milk be given before one year?
Pasteurised cow's milk can be mixed into food, and plain yoghurt can be offered from around six months. Cow's milk should not replace breast milk or formula as the main drink before 12 months.
What should I do if my baby has trouble breathing after food?
Call local emergency services immediately. Follow a prescribed anaphylaxis plan and use prescribed adrenaline if directed. Do not wait for the symptoms to pass.
