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Mixed race girls using digital tablet on sofa

Source: Inti St Clair / Getty

A new study says too much screen time can shorten the attention span of preschool-age children.  It also say screen time for kids under 2 more than doubles.

In a study in the journal PLOS ONE, researchers found that two or more hours per day of screen time made a child almost eight times more likely to meet criteria for ADHD or attention deficit/hyper-activity disorder compared with children who spent 30 minutes or less per day on the devices.