Background and aims Urinary tract infections in infants are important because of the severity and sequel potential. The aim of the study was to analyse the etiologic, clinical, demographic and evolutionary aspects of the urinary tract infections in infants admitted in Paediatric Clinic from Oradea during 5 years.

Methods We performed a retrospective study on a sample of 56 infants admitted in Paediatric Clinic from Oradea during 2012–2016 and diagnosticated with urinary tract infections. There were performed a complete anamnesis, clinic examination, laboratory tests, imagistic investigations. All the medical documentation of the patients was thorough studied.

Results From the 56 infants with urinary tract infections, 46 were full-term born, 10 were prematures. The predominance was at males: 34, 22 were females. Depending on the age-it had been noticed 11 newborns, 18 had between 1–3 months, 10 between 3–6 months and 17: 6–12 months. The aetiology of urinary tract infections was dominated by E.Coli and Klebsiella-77%. Comorbidityes were present in 49 situations. Most frequent was anemia-21 cases, dyspepsia 13 situations, malnutrition 5 infants, prolonged jaundice 3 subjects, other in 5 cases. Chronic renal failure was detected in one case. Recurrences appeared in 34% from the patients. Vesico-ureteral reflux was diagnosticated in 9 infants, urinary tract and renal abnormalities were detected in 17 situations. Surgical treatment was performed in 5 situations.

Conclusions The early diagnosis and treatment of the urinary tract infections in infants have an important role in reducing complications and the risk of renal scarring.