Maternal dietary exposure to dioxins and polychlorinated biphenyls (PCBs) is associated with language delay in 3 year old Norwegian children

•Maternal intake of dioxins and PCBs was associated with language delay at 3years.•We also found subtle reductions in language skills that were not considered deviant.•Girls appeared to be more vulnerable than boys.•Non-linear dose-response relationships were observed for both dioxins and PCBs.