This work proposes to develop a reflection about the process of intersubjectivity that begins during the initial relationship between a mother and her baby. Our approach seeks to study the interaction between the Self and the Other at a moment in which the Other finds itself in a conflicting position, in which at the same time it mirrors and is similar while still remains the Other. Using as a principal base the psychoanalytical theory of Winnicott, we approach the process of subjectivation highlighting its intersubjective dimension mutually created by the mother-child pair. In this manner, the psychological development of the baby as well as the becoming a mother of a specific baby are considered processes built through a non-verbal dialogue which is established between the mother and the newborn in the paradoxical experience of being one and being separate.