This article provides results from doctoral research concerning how mothers experience having lost a child in a case where death cannot be foreseen... the case of sudden infant death. The specificity of this loss as well as the characteristics of this grief will be covered first and foremost. The purpose of the study and the methodology used will then be made clear. Lastly, as results, meanings that mothers have attached to practices dealing with the death report and to causes of death will be described and analyzed.