During the period 1986-1991, the Italian Registry of Pediatric Chronic Peritoneal Dialysis collected data from 140 patients younger than 15 years at the start of chronic peritoneal dialysis (CPD). In this study we review the Registry's complications and patient hospitalization data. A total of 395 complications directly related to CPD were registered during 2722 dialysis-months. There were 176 episodes of peritonitis (44.5%), 161 catheter-related complications (40.7%) (103 exit-site infections, 17 leakages, 15 obstructions, 15 cuff extrusions, 5 hemoperitoneum, and 6 other complications), and 58 technique-related complications (14.8%) (39 abdominal hernias, 10 hydroceles, 5 with abdominal pain, 4 hydrothorax complications). The patient hospitalization rate during the period 1989-1991 was evaluated; the analysis referred to 106 patients who underwent treatment for a total of 1520.5 dialysis-months. Patients starting CPD in the year and patients already on CAPD spent 5.8 and 2.1 days per patient-month in the hospital, respectively; the difference was not statistically significant. The evaluation of complications (both technical and systemic) causing patient hospitalization showed that peritonitis was responsible for 43.2% of patient admissions and 36.3% of days hospitalized, catheter-related complications for 22% and 19.8%, technique-related complications for 8.3% and 5.1%, and other clinical complications for 26.5% and 38.8%, respectively.