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After several general remarks about the concept of depression and the schema of mourning described by Freud and K. Abraham, there follows a presentation of depressive semiology at different ages of childhood and adolescence in connection with the different psychopathological problem configurations which are attached to it and particularly the knowledge of what there is to lose before objects are completely established. (Can the object be lost before it has even been perceived ?). Between the depressions of babies and those of the adolescent, although there is no etiological, semiological or epidemiological continuity, a certain continuity can probably be envisaged when one considers the destiny of the original depressive material.