Introducing Solids Safely: The Latest on Allergenic Foods and Natural Immune Support

As a naturopathic physician, I know that introducing solid foods to your baby is a big milestone—and it can also feel overwhelming. If you’re like many parents, you may be wondering when and how to introduce allergenic foods like peanuts, eggs, and other common allergens. With all the advice out there, it’s hard to know what’s best for your little one’s immune system health.

But here’s the good news: recent research has shown that introducing highly allergenic foods early—between 4 and 6 months—can actually help prevent the development of food allergies. This is a shift from what we used to believe, and it’s a hopeful step for those of us wanting to give our babies the best possible start. In this article, I’ll walk you through the latest research recommendations, offer some practical advice, and share natural ways to support your child’s immune system during this crucial time.

The Shift in Guidelines: From Avoidance to Early Introduction

Not long ago, the standard advice was to wait before introducing allergenic foods like peanuts, tree nuts, or eggs. But times have changed. Studies, including the well-known LEAP trial, have shown that introducing these foods early can reduce the risk of peanut allergy by as much as 80%!1 This finding was a game-changer and has shaped new recommendations from leading health organizations, including the American Academy of Pediatrics.

So, what does this mean for you as a parent? If your baby is between 4 and 6 months old, shows signs of being ready for solid foods (such as good head control and sitting up with support), and has already tolerated a few simpler foods like fruits and veggies, you can start introducing small amounts of allergenic foods. Starting early helps your baby’s immune system learn to tolerate these foods naturally.

Latest Research Supporting Early Introduction

The benefits of early allergen introduction don’t stop at infancy. A follow-up study to the LEAP trial, published in 2024, showed that infants who consumed peanuts until age 5 had significantly lower rates of peanut allergies even at age 12. Even when these children avoided peanuts for a period, early exposure seemed to create lasting immune tolerance.1 This is promising for parents who want to give their child the best chance at avoiding food allergies long-term.

When To Be Cautious…

If your baby has severe eczema or a family history of atopic conditions (such as asthma or allergies), they may be at higher risk for developing food allergies. For these little ones, early introduction is especially important. Research suggests that babies with eczema may actually become sensitized to allergens through their skin, supporting the dual-allergen exposure hypothesis. This theory suggests that while exposure through the skin can lead to sensitization, exposure through food helps babies develop immune tolerance, which reduces allergy risks.2

If you're feeling uncertain about introducing allergenic foods, I recommend talking to your pediatrician or naturopathic doctor. They can help guide you, especially if you have concerns about your baby’s eczema or allergy risk.

Practical Advice for Introducing Major Allergens

When it comes to introducing allergens like peanuts, eggs, and dairy, a slow and steady approach works best. Here’s how you can do it:

• Start small: Mix small amounts of the allergenic food (like peanut butter) into familiar foods such as mashed fruit or yogurt.

• Observe: After introducing the food, keep an eye on your baby for any signs of allergic reactions, such as rash, vomiting, swelling, or difficulty breathing.

• Consistency matters: Once your baby has tolerated a food, keep offering it regularly (2-3 times a week). This helps maintain immune tolerance.

• Continue breastfeeding: If you’re breastfeeding, continue to do so while introducing solids. Breastfeeding provides important immune support and can help protect your baby’s immune system during this transition.

• Consult your healthcare provider: For infants with a high risk of allergies, it’s a good idea to consult with a pediatrician or allergist before introducing highly allergenic foods.3

Note from your editor: At AndyND, we strongly support breastfeeding as the optimal way to nourish infants. However, we also understand that breastfeeding is not always possible. When donor milk is unavailable, we are here to support families in what they can provide without judgment. Any reference to breastfeeding is intended to highlight its benefits, not to exclude or ostracize families who are unable to do so.

Natural Ways to Boost Immune Health for Allergy Prevention

Supporting your baby’s immune system naturally can also make a big difference in reducing allergy risk. As a naturopathic physician, I often recommend adding probiotics to your baby’s diet to promote a healthy gut microbiome, which plays a major role in regulating immune function. Studies show that an imbalance in gut bacteria may increase the risk of developing allergies.4

One of my go-to probiotics includes Lactobacillus rhamnosus, a beneficial strain that promotes the development of regulatory T cells, which help balance the immune system and prevent allergic reactions. You can introduce probiotics through breast milk, a supplement, or probiotic-rich foods like yogurt (once your baby has tolerated dairy).5 I am particularly a fan of using powdered probiotics and mixing with breast milk to make a paste, then applying this to your baby’s tongue. 

By supporting your baby’s gut health, you’re giving their immune system the best chance to handle new foods and develop tolerance naturally.

Conclusion

The landscape of infant food introduction has changed, with new research showing the benefits of introducing allergenic foods early. Whether your baby is at high risk for allergies or not, starting early and supporting their immune system through natural approaches, like probiotics, can help prevent allergies and promote lifelong health.

As a naturopathic physician, I believe in combining the best of science with natural medicine to promote optimal health. By taking a thoughtful approach to introducing allergenic foods and using immune-supporting strategies, you’re giving your baby the foundation for a healthy future.

References

1. Du Toit G, et al. Randomized trial of peanut consumption in infants at risk for peanut allergy. N Engl J Med. 2015;372(9):803-813. doi:10.1056/NEJMoa1414850.

2. Fleischer DM, Sicherer SH, TePas ET. Introducing highly allergenic foods to infants. UpToDate. Published September 18, 2024.

3. Shu SA, Yuen AWT, Woo E, et al. Microbiota and food allergy. Clin Rev Allergy Immunol. 2019;57(1):83-97. doi:10.1007/s12016-018-8723-y.

4. Yang Y, et al. The gut microbiota’s role in food allergy: Insights from research and potential clinical applications. Nutrients. 2023;16(297):1-18. doi:10.3390/nu16020297.

5. Leung PSC, et al. Probiotic supplementation and allergy prevention in infants. Clin Rev Allergy Immunol. 2023;58(3):173-182. doi:10.1007/s12016-023-02899-3.

---

About the Author

This article was written by Dr. Andy Turner, a naturopathic physician dedicated to promoting holistic health and wellness. Dr. Turner specializes in naturopathic medicine, herbal remedies, and family medicine, with a particular focus on integrative approaches to pediatric and family care. To learn more about Dr. Turner’s practice and her approach to natural, patient-centered care, visit her full bio here.