06/06/2026
A landmark study has revealed that exclusive breastfeeding for at least three months alters a baby's DNA, leaving lasting epigenetic markers linked to immunity and development.
In the largest study of its kind, an international research team has discovered that babies exclusively breastfed for at least three months carry unique epigenetic signatures in their blood.
Published in ”Clinical Epigenetics,” the study analyzed blood samples from 3,421 children aged 5 to 12 across Europe, South Africa, and the U.S. Led by the Barcelona Institute for Global Health (ISGlobal) in collaboration with the Universities of Exeter and Bristol, researchers identified distinct chemical tags on DNA linked to immunity and developmental pathways.
Remarkably, these markers—which influence how genes are expressed—were completely absent in children who had not been breastfed, showing a lasting molecular legacy of early-life nutrition.
While these findings provide a fascinating glimpse into the biological impact of infant feeding, scientists urge a careful interpretation.
Co-lead author Dr. Doretta Caramaschi pointed out that while these epigenetic markers reside on genes related to immunity and development, the study does not prove whether they directly alter a child's real-world health outcomes. However, the collaborative research, conducted via the international PACE Consortium, marks a major milestone.
To build on this breakthrough, researchers emphasize the need to study more ethnically diverse groups, aiming to fully understand how these subtle genetic volume dials might protect children from disease later in life.
source: Caramaschi, D., Fernández-Barrés, S., Casey, E., et al. (2026). Breastfeeding association with DNA methylation in the pregnancy and childhood epigenetics (PACE) consortium. Clinical Epigenetics, 18(1), 63.
