Necrotizing enterocolitis (NEC) has a multifactorial etiology and predominantly affects preterm infants, with only 13% of cases occurring in term infants. Hypoxia, sudden cardiovascular changes can also affect mesenteric perfusion. It is assumed that decreased mesenteric blood flow, followed by reperfusion, can contribute to intestinal damage, thereby increasing NEC incidence rates in term infants. This report presents a case of NEC development during follow-up for atrial flutter (AF). Repeated cardioversion caused sudden hemodynamic changes, causing NEC.