Pediatric surgery involves the surgery of fetuses, infants, children, adolescents, and young adults. It became a subspecialty of surgery in the 20th century focusing on the surgical care of birth defects. Subspecialties include neonatal surgery and fetal surgery. Surgery treats pediatric diseases like vascular disorders, otolaryngology diseases, rhinosinusitis, urology diseases, and more. Organ transplants are also common but donor availability is limited.