Descartes’s philosophy of the passions is central for an understanding of seventeenth-century ideas of affects and emotions and for the history of emotions overall. But does it have bearing today? In this article, I argue that Descartes raises the question of how the infantile relation to the maternal body influences the emotional life of the adult, a question that is still relevant for psychoanalysis and neuropsychology. In the philosophical scholarship on Descartes, the passages which pertain to the infant, or the fetus, and its alleged ‘confused thought’, are often quoted to demonstrate the challenges to dualism that are inherent in his own writings. However, I argue that these discussions point also to the complexity of the development of affects and emotions. In my reading, I show that Descartes’s ideas of the passions can be seen as precursory to psychoanalytic theories of object relations. This opens the way for a new trajectory of research involving fantasy, instincts and repression in the Cartesian analysis of emotions and affects.