How Do You Introduce Allergenic Foods to a Baby?

What are allergenic foods?

Eggs, peanuts, dairy foods, wheat, fish, soy and sesame are among foods more commonly linked with allergic reactions. That does not mean every baby will react. These foods may still have a place in a varied diet.

Older advice to delay every potentially allergenic food for a long time does not reflect current guidance. U.S. guidance supports introducing potentially allergenic foods along with other complementary foods, at about six months and not before four months. If your baby has severe eczema or an egg allergy, ask your child’s doctor when and how to introduce peanut.

When can allergenic foods be introduced?

Complementary foods generally start at about six months, when your baby can control their head, sit safely and swallow suitably textured food. Most babies do not need to wait until their first birthday to try allergens. Delaying egg and peanut without reason has not been shown to prevent allergy.

Every child’s history is different. If your baby has severe or persistent eczema, has reacted to food before, or has a known egg allergy, ask their clinician about a plan before introducing peanut, in particular.

How should the first taste go?

Offering one new allergen at a time in a very small amount makes it easier to notice which food could be involved in a reaction. Avoid introducing several unfamiliar allergens together; you can offer the new food alongside foods your baby has already tolerated.

Choose a time when your baby is well, seated safely and you can watch them. This is not a home allergy test. CDC guidance suggests offering one new single-ingredient food at a time and waiting 3–5 days before introducing another, which can help identify a possible reaction. After a suspected reaction, speak to a healthcare professional before trying again.

How to serve egg, peanut and other foods

Offer egg fully cooked and soft enough to manage. Plain pasteurized yogurt can be introduced during weaning, but cow’s milk must not replace breast milk or formula as the main drink before 12 months.

Never serve whole peanuts or nuts. Do not offer a thick spoonful of smooth peanut butter alone; thin it into a suitable soft food so it can be swallowed safely. Finely ground nuts or sesame can also be mixed into foods with an appropriate texture.

Fish should be thoroughly cooked and deboned, and shellfish should never be raw or undercooked. Always adjust the preparation to your baby’s skills.

Allergy and choking are different risks

Allergy risk and choking risk are different issues. Whole peanuts are unsafe because they may obstruct the airway; peanut-containing food prepared to a safe texture can still be part of allergen introduction.

Keep your baby sitting upright and supported throughout the meal, supervise closely and never force food into their mouth. Consider chewing and swallowing skills, not just the name of the ingredient.

What are the signs of an allergic reaction?

Hives, itchy redness, swelling of the lips or face, vomiting or unusual distress may occur after food. These signs do not diagnose an allergy by themselves, but contact a clinician before offering the suspected food again.

Difficulty breathing, noisy breathing, tongue or throat swelling, sudden pallor, floppiness or unresponsiveness may signal a severe allergic reaction. Call 911 immediately; do not wait at home for breathing or consciousness problems to settle.

What if an allergen was tolerated?

If your baby has eaten a particular allergen without a reaction, continue offering it as part of their normal age-appropriate diet. This does not mean giving it every day or meeting an exact gram target.

Refusing a food once is not proof of allergy. Turning away or closing the mouth often just means your baby does not want more right now. Respect their appetite and fullness cues.

What can you try today?

If your baby is ready for solids and has no known allergy concern, note which foods they have already tolerated. Offer a new allergen individually, in a small amount and in a safe texture.

If your baby has severe eczema, a known allergy or a suspected earlier food reaction, do not try an informal spoonful at home. Ask the pediatrician for an individual plan so new foods can be explored as safely and calmly as possible.