Major International Study Identifies Lasting Epigenetic Markers in Children Exclusively Breastfed for Three Months

Largest study of its kind finds that exclusive breastfeeding for three months creates lasting epigenetic changes in genes linked to immunity and development.

By: AXL Media

Published: Apr 16, 2026, 7:38 AM EDT

Source: Information for this report was sourced from University of Exeter

Decoding the Epigenetic Signature of Early Nutrition

A massive international collaboration has provided new evidence that the method of infant feeding can influence the molecular landscape of a child's genome. By examining blood samples from thousands of children, researchers identified specific patterns of DNA methylation—a chemical process that acts as a dimmer switch for gene activity. These markers were notably different in children who received only breast milk for at least their first ninety days of life, compared to those who were not breastfed, marking a significant step in understanding the biological "memory" of early life experiences.

The Role of Immunity and Development Genes

The study specifically highlighted that the epigenetic shifts occurred on genes intrinsically linked to the body’s immune response and various developmental milestones. According to Dr. Doretta Caramaschi of the University of Exeter, while the findings show that breastfed babies carry these distinct changes, it is not yet clear if these markers directly alter the complex functions of the immune system. The research successfully isolated these signatures by comparing umbilical cord blood to samples taken when the children were between the ages of five and twelve, ensuring the changes were acquired after birth.

Analyzing Global Data Through the PACE Consortium

To ensure the robustness of the findings, the team utilized the Pregnancy and Childhood Epigenetics (PACE) Consortium, aggregating data from 11 different international studies. The analysis incorporated 3,421 children from a diverse range of countries, including Spain, the Netherlands, Finland, South Africa, and the United States. This broad geographical and ethnic scope allowed the researchers to look past localized variables, though investigators noted that even more diverse groups must be studied in the future to fully grasp the underlying biology across all populations.