The clinical and laboratory features of urinary tract infections in 100 infants aged 5 days to 8 months are presented. Of the patients in the first three months of life 75% were boys, and of infants aged 3 to 8 months only 11% were boys; 95% of the infants were uncircumcised. Sepsis was documented in 31% of neonates, 21% of infants aged 1 to 2 months, 14% of those aged 2 to 3 months, and 5.5% of infants 3 months of age. Roentgenographic abnormalities of the urinary system were found in 45% of female and 7% of male infants. All infants responded promptly to antimicrobial therapy. The possible factors related to the predominance of male infants with urinary tract infections in the first three months of life are discussed.
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