MoBa Cohort Links Exclusive Breastfeeding to 6 Months With Modest ADHD Symptom Reduction at Ages 3-8

The University of Bergen study examined data from the Norwegian Mother, Father and Child Cohort Study, where mothers reported exclusive breastfeeding duration at 6 months postpartum. Researchers tracked parent-reported ADHD symptoms across three follow-up waves and applied sibling comparisons plus polygenic risk scores to isolate the breastfeeding variable. The association persisted but attenuated after these controls, remaining strongest for exclusive rather than any breastfeeding.

This observational design cannot separate breastfeeding effects from unmeasured maternal traits or reverse causation, where infant ADHD traits may shorten breastfeeding duration. Prior MoBa publications and a 2017 meta-analysis in Pediatrics have reported similar patterns, yet both note that maternal ADHD itself predicts shorter breastfeeding, creating circularity that sibling designs only partially resolve.

Next steps require prospective cohorts with objective feeding data and randomized breastfeeding support trials that track neurodevelopmental endpoints. Until then, guidelines should frame breastfeeding promotion around established nutritional and immunological benefits rather than ADHD prevention claims.