Descriptive, longitudinal and prospective study, at the Hospital Comandante Pinares de San Crist bal, during the period May 2017 to May 2019. The objective was to determine the behavior of antimicrobial susceptibility to first choice antimicrobials in infants with urinary tract infection. The variables were: age groups, sex, clinical forms of presentation, isolated germs, antimicrobial susceptibility and alterations in complementary examinations...