Earlier Egg Introduction Linked to Lower prevalence of Egg Allergy: Study

In order to scientifically assess the overall population effect due to this important shift in policy recommendations, a highly accurate cross-sectional study examining children ages 11 to 15 months at two different points chronologically was carefully developed by the researchers. The study design included using exactly the same patient recruitment process throughout both time frames. This consisted of recruiting parents who brought their child in for his or her regular 12-month child vaccination appointments held in special vaccine centers located in Melbourne, Australia. One sample represented baseline data prior to the shift in guidelines (2007-2011) whereas the other group represented the population after the guidelines had been established (2018-2019).

Family demographic data, known risk factors associated with allergies, exact age of egg consumption, and physical symptoms were collected using parent questionnaires. In order to isolate a true statistical correlation, direct regression standardization techniques were used to determine the expected number of allergies in 2018-2019 had there been the same baseline risk distribution as existed from 2007-2011, while multiple imputation was used to overcome missing data. The data analysis process occurred from March 2025 to March 2026.

Key findings:

• Of the 9,500 infant-parent dyads that were eligible and sent letters to be part of the study, a total of 7,209 infants from both study cohorts were finally selected.
• Both eras had a similar response rate, with each having 76% of the eligible infant-parent pair participating in the study.
• For the pre-guideline era (2007-2011), there were a total of 5,276 infants aged 12.4 months with 50.8% males (2,665 out of 5,244).
• For the post-guideline era (2018-2019), there were a total of 1,1933 infants aged 12.5 months with 51.8% males (1,001 out of 1,932).
• The median age when parents started giving egg to infants was significantly reduced from 8 months in the pre-guideline era to 6 months in the post-guideline era.
• After adjustment for all known allergy risk factors, the population prevalence of egg allergy was observed to decrease significantly from 9.2% to 7.6% from the pre-guideline era to the post-guideline era, showing an absolute reduction of 1.6 percentage points.
• From the highly susceptible group with childhood eczema, egg allergy dropped from 34.6% to 21.9%, showing a massive adjusted absolute difference of 12.7 percentage points.

In summary, this paper has provided population-level data showing that the updated guidelines for infant feeding which suggested introducing egg to babies early were effective in reducing the prevalence of egg allergy in the population. It appears from this study that the update of guidelines based on evidence from randomized trials can potentially be associated with a reduction in the prevalence of food allergy. This study has provided a crucial base for evidence-based public health in modern times.

Reference:

Koplin JJ, Shifti DM, Soriano VX, et al. Egg Allergy Prevalence Before and After Guidelines for Earlier Egg Introduction. JAMA Pediatr. Published online June 08, 2026. doi:10.1001/jamapediatrics.2026.2080