The urinary tract is the body’s drainage system for getting rid of urine (liquid waste). It includes the two kidneys, bladder (the organ where urine is stored), and two ureters and one urethra (tubes).
The blood in the body passes through the kidneys. The kidneys filter the liquid waste products (urine) out of the blood. This urine passes through the ureters and into the bladder. The urine leaves the bladder through the urethra, and passes out of the body through the opening (meatus).
Most UTIs in children occur because bacteria that are normally found in the bowel cause an infection in the urinary tract.