Objectives: Estimating caloric intake and choosing route of administration are fundamental in the nutritional support of patients being supported by extracorporeal membrane oxygenation (ECMO). The aim of this study was to review the nutritional intervention carried out in a pediatric cohort in a third-level hospital. Methods: This was a prospective descriptive study. Age, sex, underlying pathology, Pediatric Risk of Mortality score, ECMO indication, type of care, duration of ECMO support, and prognosis were collected. Type of nutritional support, route of administration, kcal/kg achieved, estimated energy requirements, and percentage of caloric objective (%CO) reached on days 3 and 5 after cannulation were recorded. Results: Twenty-four venoarterial ECMO runs in 23 patients over a period of 2 y were recorded. Of the 23 patients, 15 were <1 y of age. The underlying pathology in 56.5% was cardiac disease. Three groups were identified: parenteral nutrition (group 0, n = 7), enteral nutrition (group 1, n = 8), and mixed nutrition (group 2, n = 7). The median of the %CO was 33.34 (0 84) on day 3 and 87.75% (78.4 100) on day 5 of ECMO, respectively for group 0; 75.5 (42.25 98.5) and 85% (24.4 107.7) in group 1 and 68.7 (44.4 82.2) and 91.2% (35.5 92) in group 2 (P > 0.05). Children <12 mo of age and cardiac patients represented 85.71% and 71.43% of total patients in group 0. Among the eight episodes of exclusive enteral nutrition, no complications were identified. Conclusion: Enteral nutrition appears to be safe in the setting of hemodynamic stability and absence of contraindications and is equivalent to other nutritional interventions in terms of compliance with estimated energy requirements.