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In the vast field of care and treatment for children and adolescents, questions linked to diagnosis often transcend the aspects of the treatment itself and the therapeutic bonds as well as the multiple exchanges between professionals involved. Diagnosis in child psychiatry is a dynamic process, modifiable and momentary in that most pathological organizations during this period are in permanent transformation. In a specific way and in accordance with the developmental process, the theme of diagnosis in child psychiatry refers more to the question of evolving risk than to the question of the pathological state itself. The aspects of continuity of mental disorders from childhood to adulthood are a veritable developmental issue. There are two opposing points of view in the literature. The first, in connection with pre-determinism, believes that their trajectories are already traced, the uncertainty being in the diagnosis itself. In concrete terms, the idea is to spot individuals at risk as early as possible because they are carriers of a disorder that must be treated. The second point of view holds that the trajectories are not pre-determined but are constantly being rewritten. Here, the risk is not at the diagnostic level, but rather in the prognosis with the goal being prevention rather than prediction. The article proposes reflections of four clinical psychiatrists in infant-juvenile psychiatry on this theme, in the light of their practice and their exchanges.