How to Safely Introduce Allergenic Foods to Babies: Eggs, Peanuts, and More (Step-by-Step Guide)

Introducing solid foods to your baby can be exciting but also a bit overwhelming—especially when it comes to allergenic foods like eggs, peanuts, or fish. In recent years, expert recommendations have shifted dramatically. Foods once avoided are now encouraged to be introduced early as a strategy to prevent allergies.

This comprehensive guide will walk you through how to safely introduce allergenic foods to your baby, what to watch for, and how to do it confidently.

Why Early Introduction of Allergenic Foods Matters

Research shows that introducing allergenic foods between 6 and 12 months can lower the risk of food allergies significantly. This period is known as an “immunological window” when your baby’s immune and digestive systems are best equipped to build tolerance to new foods.

Early exposure helps the immune system recognize these foods as safe rather than threats, which can prevent allergic reactions later in life.

Common Allergenic Foods to Introduce Early

Experts recommend introducing these major allergenic foods safely and early:

• Eggs
• Peanuts
• Cow’s milk products (like yogurt or cheese, not milk as a drink)
• Fish
• Wheat
• Soy
• Tree nuts
• Shellfish

Introducing these foods early and regularly can help build tolerance and reduce allergy risks.

When and How to Start Introducing Allergenic Foods

Before adding allergenic foods:

• Make sure your baby has already tried and tolerated basic solids like fruits, vegetables, fortified cereals, or meats.
• Ensure your baby is healthy—no fever or discomfort on the day of introduction.
• Choose a morning or early time of day so you can monitor for any reactions.
• Always introduce new allergenic foods at home, not in public places or restaurants.

Considerations for Babies With Family Allergy History

If food allergies run in your family or your baby has specific health concerns, talk to your pediatrician before introducing allergenic foods. This is especially important if:

• You or your partner have a history of severe food allergies.
• Your baby has moderate to severe eczema.
• Your baby has had previous allergic reactions.

Step-by-Step Guide to Introducing Allergenic Foods to Your Baby

Step 1: Choose a Calm, Comfortable Time

Avoid introducing allergens when your baby is very hungry or tired. Pick a relaxed environment free from distractions.

Step 2: Start Small

Offer just 1/4 to 1/2 teaspoon of the allergenic food. For example, give a small amount of cooked egg or peanut butter diluted with water or yogurt.

Step 3: Watch Closely for 2 Hours

Most allergic reactions appear within two hours. Watch for signs like:

• Redness or rash
• Swelling around lips, tongue, or eyes
• Vomiting or diarrhea
• Coughing, wheezing, or hoarse voice

If you notice any of these symptoms, seek emergency medical care immediately.

Step 4: Repeat Often

If no reaction occurs, continue offering the allergenic food 2–3 times a week. Regular exposure helps maintain tolerance.

What to Do If Your Baby Has an Allergic Reaction

• For mild symptoms (such as a small rash), stop feeding the food and contact your pediatrician.
• For serious symptoms (such as breathing difficulties), call emergency services right away.

How Little Lunches Can Support Your Baby’s Food Journey

Introducing allergenic foods doesn’t have to be stressful. The Little Lunches app offers tailored meal plans that include allergen introduction, baby-safe recipes, organized grocery lists, and even grocery delivery through Instacart in select areas.

Download the app today to start your baby’s feeding journey with confidence, providing safe, nutritious, and diverse foods from the beginning.

This guide is based on current pediatric nutrition research and expert clinical recommendations. Always consult your pediatrician with any concerns about your baby’s diet or health.

Written by: Dr. Diana Jimenez, pediatrician specialized in child nutrition, lactation, and child development.