Objectives: With this research, we determined the distribution of average ages, the number of operated in the first year of life, the growth trend line or decrease in average ages and the number of operated in the first year of life for boys operated due to undescended testicles at the Clinic for Pedriatic Surgery of University Hospital of Split from 2006.-2020. We investigated whether there is a connection between getting a boy at the time of surgery and the place of residence. We also determine whether there is a difference in the frequency of occurrence of right-sided in relation to left-sided undescended testicles and check their association with treatment and length of hospitalization. Materials and methods: A retrospective study was conducted which included 913 boys up to 18 years of age. Necessary data were collected from written protocols and archives of medical history. Boys undergoing orchidopexy due to migrating testicle during inguinal hernia surgery were excluded from the study. Results: The median age of boys is ranged from 3-7 years and did not show a decreasing trend. The percentage of boys operated in the first year of life is 17.3% and shows a slight upward trend from 2006. to 2015., while after that the trend shows stagnation. The largest number of boys is in the age group over 7 years (47.9%). Split, Omiš and local islands have an increasing trend in the percentage of boys operated in the first year of life, while Metković, Makarska, Sinj, Vrgorac, Trogir, Imotski show a decreasing trend. No difference was found in the age of boys referred for treatment from urban or rural areas. The undescended testicle is located on the right side in 59.23% of cases and no statistically significant difference was found between the side of undescended testicle with age and length of hospitalization (P=0.781, P=0.734). The average length of hospitalization was 1.8 days. Conclusions: Despite a satisfactory percentage of boys with orchidopexy in the first year of life and a proven slight trend of increasing their number, the average age of boys with orchidopexy is still quite high (3-7 years), and the high percentage of boys with undescended testicle over 7 years is worrying.