Pediatric surgeons treat a wide array of conditions including, but not limited to, congenital malformations (such as congenital diaphragmatic hernia and congenital heart defects), gastrointestinal issues (like appendicitis and intussusception), and trauma-related injuries. They also manage pediatric cancers, such as neuroblastoma and Wilms' tumor. Their role is crucial in both emergency and elective surgeries.