Résumé : The work of the liaison psychologist with hospitalized sick children is to make it possible to disengage from and to transform potential psychic trauma created by the context of the illness (announcements of sever diagnoses, separation, pain, death anxiety, etc.), and to facilitate the emergence of a psychic process of subjective appropriation. The idea is to include the clinician's work in a transitional dimension at different levels. First, by accompanying the child, the parents, the siblings and the caregivers in the hospital setting, then by establishing the sufficiently good enough favorable conditions conducive to subjective appropriation of the disease by the child and those close to him, through a work of symbolization, holding and creativity.,The work of the liaison psychologist with hospitalized sick children is to make it possible to disengage from and to transform potential psychic trauma created by the context of the illness (announcements of sever diagnoses, separation, pain, death anxiety, etc.), and to facilitate the emergence of a psychic process of subjective appropriation. The idea is to include the clinician's work in a transitional dimension at different levels. First, by accompanying the child, the parents, the siblings and the caregivers in the hospital setting, then by establishing the sufficiently good enough favorable conditions conducive to subjective appropriation of the disease by the child and those close to him, through a work of symbolization, holding and creativity.