Updated project metadata. Abusive head trauma (AHT) is a leading cause of mortality and morbidity in infants. We explored novel AHT biomarkers via untargeted proteomics of peripheral postmortem blood (PMB) specimens collected during medico-legal autopsies of infants. The panel of PMB biomarkers was confirmed in antemortem serum samples as a potential signature capable of being applied to living patients to support AHT screening and improve their prognosis through early medical care.