Introduction: Children with tracheostomy have an increased risk of bacterial colonization and infection of the lower respiratory tracts. This study aimed to investigate the effects of nebulized antibiotics on the bacterial load, the need for oral antibiotics, the number of hospitalizations, and the length of stay in the intensive care unit in tracheotomised children with persistent colonization. Methods: Children with tracheostomy and persistent bacterial colonization who were started on nebulized antibiotic therapy after a lower respiratory tract infection were included in the study. Nebulized gentamicin or colistin were used according to the results of the tracheal aspirate cultures. Demographic and clinic characteristics were recorded from one year prior until one year after initiation of nebulized antibiotic treatment.