Quick Answer
When your baby is ready for complementary foods, usually around 6 months, offer common allergens in safe textures rather than routinely delaying them. Introduce one new allergen at a time, alongside foods already tolerated, and keep offering it regularly once tolerated.
For fish, use fully cooked, carefully deboned flesh in a manageable texture. For sesame, thin smooth tahini into a familiar food rather than offering a sticky spoonful. Get individualized advice first for a previous reaction, known food allergy, or severe eczema, particularly when planning peanut introduction.
Which Foods Are Common Allergens?
Common allergenic foods include milk, egg, peanut, tree nuts, wheat, soy, sesame, fish, and shellfish. Any food can potentially cause a reaction.
These foods are not interchangeable. Tolerating peanut does not establish tolerance to tree nuts, and tolerating one fish does not prove that every fish or shellfish is safe.
When Should I Start?
Begin complementary foods when your baby has appropriate head control, can stay upright with support, and can take food into the mouth and swallow it. Ask for a specific plan if your baby was premature or has feeding or swallowing difficulties.
There is no established benefit to routinely delaying allergenic foods beyond readiness. However, evidence for prevention and recommended serving plans differs between allergens; eating a food does not guarantee that an allergy will never develop.
For severe eczema or an existing food allergy, contact the clinician early so a recommended assessment does not become an indefinite delay.
How Do I Make a First Introduction?
- Choose a time when your baby is well and you can watch them closely.
- Prepare one new allergen in a safe form, without other unfamiliar allergenic ingredients.
- Offer a small amount without pressure, following any prescribed introduction plan.
- Watch for symptoms during and after the meal; reactions may be immediate or delayed.
- If tolerated, include the food regularly in your baby's diet.
Do not rub food on skin or lips as an allergy test. Do not give antihistamines beforehand to try to prevent or hide a reaction.
How Do I Offer Fish?
Choose fully cooked fish with bones carefully removed, and mash or finely flake it into a texture your baby can manage. Check each portion for bones even when the package describes it as boneless.
Choose lower-mercury options according to current local fish advice, such as commonly recommended salmon or pollock. Avoid raw fish and do not use tough, salty smoked fish as a first serving.
Fish and shellfish are different allergen groups. Do not assume eating fish establishes shellfish tolerance.
How Do I Offer Sesame?
Smooth tahini can be stirred into a familiar puree, cereal, or another suitable food and thinned until it is not sticky. Check the ingredients and avoid introducing several new allergens in the same mixture.
Hummus may contain sesame, but recipes vary and can include other ingredients not yet introduced. Sesame oil is not a reliable substitute for introducing sesame protein because its protein content varies.
Do not offer a thick spoonful of tahini or use scattered whole seeds as a controlled first serving.
What About Other Common Allergens?
- Egg: Offer thoroughly cooked egg in a soft, manageable texture.
- Peanut and tree nuts: Use smooth butter or suitable powder mixed and thinned into food. Never offer whole nuts or sticky spoonfuls of nut butter.
- Milk: Plain pasteurized yogurt can be an option. Cow's milk should not replace breast milk or formula as the main drink before 12 months.
- Wheat: Offer suitably prepared cereal or soft pasta.
- Soy: Soft tofu can provide an appropriate food form.
- Shellfish: Use fully cooked, finely minced flesh, removing shells and avoiding rubbery pieces.
Introduce distinct foods thoughtfully rather than assuming one nut or species covers an entire group. A dietitian or allergy team can help if you need a structured plan.
Do I Need a Fixed Dose or Waiting Period?
No single dose or interval applies to every allergen and baby. Your clinician may provide specific amounts and timing for a particular prevention or allergy plan.
Keep new allergens separate enough to identify what was offered if symptoms appear. Follow local clinical guidance about spacing introductions rather than using a rigid internet schedule that delays foods unnecessarily.
Once individual ingredients are tolerated, they can be combined in normal meals. Keep a simple record if helpful, without turning meals into tests.
What If My Baby Refuses?
Do not force a taste. Try a different safe presentation on another occasion, using a familiar food as the base.
Ask for support if refusal interferes with a prescribed plan or your baby has a very restricted diet. Do not put allergen foods or powders into a bottle to bypass refusal.
What If My Baby Already Has an Allergy?
Follow the allergy team's instructions. A known or suspected trigger should not be reintroduced at home to build tolerance.
Some children tolerate a particular cooked form but not another. Milk or egg ladders and oral immunotherapy are individualized clinical approaches, not general first-introduction advice.
Discuss introducing other foods so you can avoid unnecessary restrictions while protecting safety and nutrition.
What Parents Can Try
- Plan one new allergen within a familiar meal.
- Use safe textures and supervise upright eating.
- Check mixed-food ingredient labels.
- Keep tolerated foods in a regular rotation.
- Share introduction history and any action plan with caregivers.
- Seek advice early when risk factors or previous reactions are present.
When Should I Seek Help?
Stop the suspected food and seek medical advice for hives, swelling, vomiting, or another possible reaction. Do not re-offer it before receiving guidance.
Breathing difficulty, tongue or throat swelling, collapse, or a baby becoming pale and floppy can indicate a severe allergic reaction. Use prescribed epinephrine promptly according to the action plan and call emergency services. Severe reactions may occur without a rash; do not rely on antihistamines instead of epinephrine.
Repeated vomiting with pallor, marked sleepiness, or floppiness in the hours after eating also needs urgent assessment, even without hives. Seek review for persistent symptoms or growth concerns rather than excluding foods on your own.
Key Takeaway
Introduce common allergens in safe forms when your baby is ready, one new allergen at a time, and continue tolerated foods regularly. Fish needs careful cooking and deboning; sesame can be offered as well-thinned tahini. Previous reactions and higher-risk circumstances require an individualized plan.
Parents Also Ask
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This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your pediatrician or a qualified healthcare provider with questions about your baby's health.