Psychoanalytic Parent–Infant Psychotherapy (PIP) has recently been offered in Poland. It is based on psychoanalytic theories but also uses data from current scientific research. The article is a psychodynamic conceptualization of the PIP psychotherapy process. The therapist’s hypotheses regarding the conscious and unconscious components of the relationship between parents and infant and the problems occurring therein play an important role. On their basis, therapeutic goals are formulated and methods that can be used as part of therapeutic intervention are selected. Therapeutic hypotheses include countertransference, observations and interpretations of the therapist. The article describes the process of PIP psychotherapy for an infant and his parents, which included 40 sessions. It started when the child was 5 weeks old and ended when he was 17 months old. From the beginning, the issue of diagnosing Asperger’s syndrome was an important topic. Although, according to the parents, this diagnosis could have been stated for the child in the future, it already played an important role in the child’s life when the therapy began. This work describes what happened to the specter of Asperger’s syndrome in the family described above, during the process of PIP therapy.