Parents shouldn't let kids repeat profanity.

The first swear word from a young child should be the last, according to Marcia Summers, professor of educational psychology, Ball State University, Muncie, Ind. Parents effectively can stop youngsters from using bad language by immediately confronting them, she argues.

"I remember when it happened to me a few years ago," notes Summers, the mother of three youngsters. "1 just stood there and asked, 'What did you say?' Like most parents, I couldn't believe that this small voice could say such a terrible word. I think we, as parents, are shocked because we tend to believe that children shouldn't be using adult language."

At the first naughty word, Summers discourages parents from taking the child to the bathroom for a mouthful of soap. Instead, they should discuss with the youngster what he or she uttered. Find out if the youngster actually understands the word or phrase, or if he or she is mimicking another family member. "Sometimes, you'll be shocked when they give a pretty good explanation."

Kids pick up swear words from a variety of sources, ranging from an older sibling to the bus driver to a rented video movie. "Most of...