Final answer:
Hypospadias is the congenital abnormality of the urinary system found in male infants only.
Step-by-step explanation:
The congenital abnormality of the urinary system found in male infants only is hypospadias. Hypospadias is a condition where the opening of the urethra is located on the underside of the peni* instead of at the tip. This condition is present from birth and requires surgical correction. It is important to note that renal calculi, polycystic kidney disease, and horseshoe kidney can occur in both males and females.