Fournier's gangrene, a rare and life-threatening soft tissue infection affecting the genitalia and perineum, results from various microorganisms. This rapidly progressing necrotizing fasciitis yields higher mortality and morbidity rates. We report a case of a 1-month-old male infant with Fournier's gangrene due to perforation transverse colon complicated with septic shock and pneumonia also accompanied by patent processus vaginalis. Radiological findings of pneumonia and pneumoperitoneum were exhibited. Early diagnosis and management are demanded to mitigate life-threatening and improve the prognosis. The patient underwent incision drainage, peritoneal lavage, exploratory laparotomy, colostomy, necrotomy debridement, and patent processus vaginalis ligation after hemodynamic status stabilization.