Background The Disease Control Priorities (DCP-3) group defines surgery as essential if it addresses a significant burden, is cost-effective, and is feasible-yet the feasibility component remains largely unexplored. The aim of this study was to develop a precise definition of feasibility for essential surgical procedures for children. Methods Four online focus group discussions (FGDs) were organized among 19 global children's surgery providers with experience of working in low-and lower-middle-income countries (LMICs), representing 10 countries. FGDs were transcribed verbatim, and qualitative data analysis was performed. Codes, categories, themes, and subthemes were identified. Results Six determinants of feasibility were identified, including: adequate human resources; adequate material resources; procedure and disease complexity; team commitment and understanding of their setting; timely access to care; and the ability to monitor and achieve good outcomes. Factors unique to feasibility of children's surgery included children's right to health and their reliance on adults for accessing safe and timely care; the need for specialist workforce; and children's unique perioperative care needs. FGD participants reported a greater need for task-sharing and shifting, creativity, and adaptability in resource-limited settings. Resource availability was seen to have a direct impact on decision-making and prioritization, e.g., saving a life versus achieving the best outcome. Conclusions The identification of a precise definition of feasibility serves as a pivotal step in identifying a list of essential surgical procedures for children, which would serve as indicators of institutional surgical capacity for this age group.