What can I do to prevent my daughter from getting another urinary tract infection?

DEAR DOCTOR K: I think my 4-year-old daughter may have a urinary tract infection. How will it be treated? And what can I do to make sure she doesn't get another one?
DEAR READER: A urinary tract infection (UTI) occurs when bacteria infect urine in the kidneys, bladder or urethra, a small tube that connects the bladder to the outside.