Objective: To analyze the survival of exclusive breastfeeding and the factors associated with its cessation in the first month among pairs seen by a lactation consulting team. Method: This is a prospective cohort conducted with mother-infant pairs treated at the Hospital de Clínicas of Porto Alegre. Results: The sample consisted of 150 pairs. The survival curve indicates that 52.9% of the children remained on exclusive breastfeeding. The hierarchical model was constructed in four levels, and the factors associated with the cessation of exclusive breastfeeding were the milk supplementation during hospitalization, breast problems after hospital discharge and use of pacifiers. Conclusion: Awareness of these factors favors the early detection of pairs that may be predisposed to cessation of exclusive breastfeeding, who require greater support, dedication and care
