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This paper discusses the benefit of assessments of psychotherapies in short-term and joint therapies of mothers-babies or parents-babies. It reviews the main findings from an earlier study conducted at the Psychiatric Service for Children and Adolescents at Geneva University Hospital. The results of short-, medium-, and long-term assessments can be used to fine-tune our indications, better understand the stakes of the therapeutic process, and define various types of parent conflicts, which underpin the symptoms expressed by babies. A clinical example illustrates the psychodynamic technique. The results show the importance of early interventions, as well as their advantages and limits. A longitudinal study on a preadolescent population offers measured evaluation and a means to consider the long-term effects of early short-term therapy. Focusing on assessment and evolution, this paper attempts to demonstrate the benefit of research in psychotherapy and how research can improve our therapeutic tools.