A comprehensive study published on August 27, 2026, by researchers at the University of Bergen examined data from 37,600 families in the Norwegian Mother, Father, and Child Cohort Study to analyze the relationship between breastfeeding duration and ADHD symptoms in children. The findings revealed that longer exclusive breastfeeding, up to the six-month limit examined, is linked to significantly fewer Attention-Deficit/Hyperactivity Disorder symptoms in both boys and girls across early childhood. The lead researcher, Berit Skretting Solberg, emphasized that while genetics remain the primary risk factor for neurodevelopmental conditions like ADHD, nutritional elements in breast milk such as long-chain fatty acids, amino acids, and antibodies play a supportive role in brain growth and immune development. The association was most prominent when children reached ages three and five, and remained detectable through age eight. Addressing confounding variables, the research team adjusted for genetic susceptibility and sociodemographic factors, and even compared siblings within the same households who experienced different feeding patterns. Despite these rigorous statistical adjustments to account for hereditary and environmental overlaps, a clear and moderate protective association persisted between the duration of exclusive breastfeeding and reduced ADHD symptom levels. The authors advise caution against oversimplified interpretations, noting that observational studies cannot definitively prove direct causality and that many medical or personal reasons can limit breastfeeding. Ultimately, the study highlights early nutrition as one of multiple modifiable environmental factors that may contribute to mitigating neurodevelopmental symptom severity alongside strong genetic predispositions.
