Why the advice flipped
For years, parents were told to delay allergenic foods. Then the landmark LEAP study (2015) tested the opposite in high-risk babies — those with severe eczema, egg allergy, or both — and found that introducing peanut early and continuing it cut peanut allergy by about 80% by age 5. A leaky skin barrier may let food proteins meet the immune system through the skin before the body has met them in food, priming an allergy; getting the food in early may teach tolerance instead (this is the same story behind our atopic march guide).
What the guidelines now say
- To help prevent peanut and egg allergy, these foods are generally introduced around 6 months of age (and not before 4 months), once a baby is developmentally ready for solids.
- For high-risk babies (severe eczema and/or egg allergy), guidelines advise a specific, careful approach — sometimes as early as 4–6 months and, in some cases, after checking that it's safe to do so first.
- Real-world data is encouraging: since early-introduction guidance took hold, peanut allergy rates in young children have measurably dropped.
The critical part: the higher a baby's risk, the more this should be guided by a professional. For a baby with severe eczema or a known egg allergy, your pediatrician or an allergist may want to assess your child before peanut is introduced, and advise exactly how to do it safely. Please don't start high-risk introduction from a web page — this is precisely the situation the guidelines say to individualize with a doctor.
The everyday, lower-risk picture
For a baby with mild eczema and no egg allergy, the message is usually reassuring and simple: don't needlessly avoid these foods; introduce them around 6 months as part of normal weaning, in infant-safe forms (never whole nuts — a choking hazard). Even so, if you're unsure about your baby's risk level, a quick check with your doctor settles it.
And keep treating the eczema
Because the skin barrier is part of the story, keeping your baby's eczema well-controlled with faithful moisturizing and your doctor's plan isn't separate from allergy prevention — it's part of the same picture. (For the food-vs-eczema myths, see our diet and eczema guide.)
One calm record for the allergist visit
Bring the clearest picture of your baby's eczema to the conversation about food introduction. Ollowen turns your daily check-ins into exactly that — severity, patterns, questions — ready for the doctor.
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Sources
- Du Toit G, et al. LEAP: Randomized Trial of Peanut Consumption in Infants at Risk. NEJM, 2015.
- FoodAllergy.org. Peanut early-introduction guidelines.
- American Academy of Pediatrics. Guidelines for early food introduction and patterns of food allergy, 2025.
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