Feeding Your Baby: How to Introduce Allergens Safely

Introducing allergenic foods to your baby can feel intimidating, but research shows that early, safe introduction may actually reduce the risk of food allergies.1,2,3 By knowing when, what, and how to introduce these foods, parents can help their babies develop a diverse diet while keeping safety a top priority.

Is Your Baby Ready for Solids?

Before introducing any solid foods, it’s important to make sure your baby is developmentally ready. Signs of readiness include:

  • Good head and neck control

  • Ability to sit upright with minimal support

  • Showing interest in food, such as reaching for food or watching others eat

  • Loss of the tongue-thrust reflex (allows them to move food to the back of the mouth) 4

High chair positioning matters too! Aim for the “90-90-90” position: hips, knees, and ankles at right angles, with baby sitting upright. This posture supports airway safety, trunk control, and self-feeding skills. Avoid feeding your baby in any kind of reclined position, as this raises choking risk. Choose a chair with a footrest for stability, always supervise meals, and remember: gagging is normal, choking is an emergency. Offer age-appropriate textures like mashed, pureed, or soft graspable pieces.1,5

When to Introduce Allergenic Foods

Pediatric guidelines recommend introducing allergenic foods around 6 months of age (and when they show signs of readiness listed above), but never before 4 months. Introducing allergenic foods between 4-6 months has been linked to lower rates of peanut and egg allergy. Early exposure helps the immune system recognize foods as safe and reduces the likelihood of developing allergies.1,2,3

Recall the top 9 allergens discussed in the previous blog post that include peanuts, eggs, milk, tree nuts, fish, shellfish, wheat, soy, and sesame. Introduce one new allergen at a time to help identify the cause of any potential reaction.

How to Introduce Foods Safely

  • Choose the right time: Offer allergenic foods when your baby is healthy (not sick or teething) and at a time you’ll be home for a few hours to watch for reactions.

  • Start with tiny amounts: Just try pea-sized amounts at first. You can mix allergens into foods your baby already tolerates (e.g. mixing a small amount of peanut butter into oatmeal).

  • Introduce earlier in the day: This gives you plenty of time to observe your baby’s response, rather than offering something new right before bedtime.

  • Offer the same allergen multiple times: One exposure isn’t enough. If tolerated, keep including the allergen in the diet regularly.

  • Create a calm environment: Seat your baby upright in the high chair, avoid distractions, and watch closely.1,4

When to Seek Medical Advice

Talk to your pediatrician if your baby:

  • Has severe eczema or another known allergy

  • Has a strong family history of food allergies

  • Reacts to any food (rash, vomiting, swelling, or breathing difficulties)

Seek immediate emergency care if your baby has difficulty breathing, swelling of the face or lips, or repeated vomiting.

Practical Steps for Parents

  1. Pick one allergenic food to start.

  2. Offer a small portion in a safe form.

  3. Watch closely for any reaction.

  4. Wait at least one day before introducing another allergen.

  5. Consult your pediatrician for guidance if needed.

By following these steps and ensuring your baby is ready for solids, parents can confidently introduce allergenic foods, support their baby’s immune development, and reduce the risk of allergies.

Quick Reference Guide for Early Allergen Exposure ~6 Months


References


  1. U.S. Department of Agriculture and U.S. Department of Health and Human Services. Dietary Guidelines for Americans, 2020-2025. 9th Edition. December 2020. Available at: https://www.dietaryguidelines.gov 

  2. De Silva D, Halken S, Singh C, et al. Preventing food allergy in infancy and childhood: Systematic review of randomised controlled trials. Pediatric Allergy and Immunology. 2020;31(7):813-826. doi:10.1111/pai.13273

  3. Abrams EM, Shaker M, Stukus D, Mack DP, Greenhawt M. Updates in food allergy prevention in children. PEDIATRICS. 2023;152(5). doi:10.1542/peds.2023-062836

  4. When, what, and how to introduce solid foods. Infant and Toddler Nutrition. Published March 20, 2025. https://www.cdc.gov/infant-toddler-nutrition/foods-and-drinks/when-what-and-how-to-introduce-solid-foods.html

  5. Gorman JK. Sitting in the high chair when starting solids. Eat Play Say Blog. Published September 3, 2025. https://eatplaysay.com/sitting-in-the-high-chair-when-starting-solids/

  6. Mathew M, Wong KH, Munoz JS, Leeds S. Prevention and management of food allergy in infants. Immunology and Allergy Clinics of North America. 2025;45(3):367-385. doi:10.1016/j.iac.2025.04.005

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