How to Introduce Allergens Safely at Home
By Pranai · Reviewed by Dt. Prernna Kalra, Clinical Nutritionist — follows IAP/WHO/NIN guidelines
Published · Updated
Early introduction of common allergens from six months is associated with lower allergy risk — not higher. This guide walks through all eight allergens using Indian food vehicles, the three-day observation rule, what a reaction looks like at each severity level, and why morning introductions are safer than evening ones.
The instinct to delay allergens — to wait until two years, or three, or until the child "is ready" — comes from a reasonable place. Allergic reactions are frightening, and avoiding the thing that might cause one feels like protection.
The current evidence, reflected in IAP IYCF 2022 guidelines, points in the opposite direction. Early introduction of common allergens — from six months, one at a time, in small amounts — is associated with lower rates of allergy development, not higher. Delaying introduction does not protect. It may increase risk.
Here is how to do it safely at home.
The Rule That Governs Everything: One New Allergen at a Time
Introduce one new allergenic food every three days. Not because reactions always happen within three days — most immediate reactions happen within two hours — but because three days gives you a clear observation window before the next introduction. If something happens, you know exactly what caused it.
Do not introduce a new allergen on a day when your baby is unwell, has just received a vaccination, or is already showing signs of an existing reaction. Clear days only.
The Eight Allergens to Introduce by Nine Months
IAP guidelines identify eight foods responsible for the majority of allergic reactions. All eight should be introduced by nine months, one at a time.
Egg — start with egg yolk first, at seven months. Hard boil, mash with ghee or breast milk, mix into khichdi or dal. Introduce egg white separately, two to three weeks later. Egg is one of the highest-quality proteins and the best source of choline for brain development available in the Indian kitchen.
Peanut — smooth peanut butter, thinned with warm water to a very loose consistency, mixed into porridge. A quarter teaspoon to start. Not whole peanuts — these are a choking hazard until age five.
Tree nuts (almonds, cashews) — grind to a fine powder first, mix into porridge or dal. Ragi almond powder is an excellent combined introduction — nutritionally dense and easily incorporated into the morning porridge.
Wheat — introduce via soft suji (semolina) halwa, cooked soft and easy to swallow, or soft-cooked suji porridge. Very soft small pieces of roti soaked in dal work once your baby is managing texture. Most Indian babies have no reaction to wheat — but it is worth a deliberate introduction with observation rather than accidental first exposure.
Fish — flaked, boneless, well-cooked, from nine months. Rohu and catla are good first fish — mild in flavour, widely available, and excellent sources of DHA. Mix into khichdi.
Shellfish — prawns, flaked and well-cooked, from nine months. Not a priority if not part of your family's diet, but introduce if it is.
Soy — most Indian babies encounter soy via formula if they are formula-fed. For breastfed babies, introduce via a small amount of tofu, mashed, from eight months.
Dairy — introduce from seven months, not six. Dairy is heavier in nature than the first foods your baby has been managing, and the extra few weeks give the gut time to settle into complementary feeding first. Start with a small amount of full-fat curd at room temperature.
What a Reaction Looks Like — and What to Do
Mild reactions: Hives or redness around the mouth, mild swelling, watery eyes, runny nose. Stop that food, note it, and discuss with your paediatrician at your next visit.
Moderate reactions: Significant swelling, vomiting, widespread hives. Call your paediatrician same day.
Severe reactions (anaphylaxis): Difficulty breathing, throat swelling, collapse, rapid change in alertness. This is rare but requires emergency care immediately. Call emergency services.
Most home allergen introductions produce no reaction at all. The protocol exists so that if a reaction does happen, it happens in a controlled, observed setting rather than as an accidental exposure.
The Timing That Matters
Introduce new allergens in the morning or at lunchtime — not at the last meal of the day. This gives you several hours of waking observation time after introduction. A reaction at 10am is manageable. A reaction at 10pm, when you may be less alert, is more stressful.
This article is for educational purposes only. For personalised guidance, always consult your paediatrician.
Next: First Foods for Indian Babies: Dal Water to Khichdi
Common Questions
When should I introduce allergens to my baby?
From six months, one at a time, with three clear days between each. Early introduction is associated with lower rates of allergy development, not higher — delaying does not protect.
How do I introduce egg to an Indian baby?
Start with egg yolk at seven months — hard boiled, mashed with ghee or breast milk, mixed into khichdi or dal. Introduce egg white separately, two to three weeks later.
When can babies have dairy?
From seven months. Dairy is heavier in nature than early first foods, and the extra weeks give the gut time to settle into complementary feeding. Start with a small amount of full-fat curd at room temperature.