Abstract: This article is available in French only. After a few general observations on theconcept of depression and the mourningscheme described by S. Freud and de K. Abraham, the depressive semiology indifferent stages of childhood and adolescencewas presented as being related to differentinterconnected psychopathological issues,especially to the question: What can be lostbefore the complete object instauration (canan object be lost before it can be perceived?). On the other hand, as regards thedepressions of babies or teenagers, if there isnot an etiological, semiological orepidemiological continuity, there isundoubtedly continuity in the plan of theoriginary depressive materials destiny.