FHU CHILD "Reducing mortality and severe morbidity in the first 3 years of life" is labeled by the Assistance Publique Hôpitaux de Paris (AP-HP), Inserm and the Universities of Ile-de-France. It was structured for 5 years (2020-2024) to respond to the challenge of the historic increase in peacetime of infant mortality in France and more generally of mortality under 3 years of age and the severe morbidity associated with it. The FHU CHILD partners will focus their efforts on improving the prevention, diagnosis and management of acute infections, sudden unexpected infant death and physical abuse.