This article discusses the importance of good primal splitting as the basis for the child's emotional and cognitive development. A theoretical introduction analyses the possible pathologies of primal splitting, as they were first pointed out by Melanie Klein and then by some post-Kleinian authors, in particular Donald Meltzer. This is followed by some excerpts from the clinical material of the first year of the psychoanalytic psychotherapy of a three-year-old child suffering from eating problems. Starting from the child's play activity, the author tries to identify the splitting problems that underlie the child's view of the world, and to address these with him. The article shows how at times it can be useful to speak also to the child's intelligence, combining the usual analytic work (containment of anxiety and analysis of transference) with the analysis of the child's distortions and cognitive misconceptions. The article also suggests that faulty primal splitting tends to be transmitted from one generation to the next.