This article in Pediatrics, "Early Television Exposure and Subsequent Attentional Problems in Children," examines the first-ever study linking early television watching with later attention and concentration problems. Researchers from the University of Washington found that, for children age 3 and younger, every hour of television they watched led to a 10-percent increase in the likelihood of attention problems at age 7. Even before their first birthday, kids watch more than 2 hours of television a day.

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