[Update on safe sleep recommendatios]

Sudden unexpected infant death may be explained, cause by an etiology, unexplained but insufficiently investigated, or unexplained when a full investigation fails to determine the cause. Unexplained sudden death in infancy or sudden infant death syndrome particularly affects the most vulnerable populations. The death of these children who are born with alterations in their neurodevelopment is the visible part of a problem that originates in pregnancy. Reducing the number of vulnerable children depends on health policies and, above all, on improving the living conditions of the population. These are long-term actions. Knowing in depth the risk factors that can trigger unexpected death is what can be done now. The update of the recommendations on safe sleep reflects new knowledge based on scientific evidence and a comprehensive approach to the sociocultural aspects related to this problem.