One excerpt from one of a million studies that all contradict each other.
"Young children who watch television face an increased risk of attention-deficit problems by school age, a study has found, suggesting that television might overstimulate and permanently 'rewire' the developing brain. For every hour of television watched daily, two groups of children - ages 1 and 3 - faced a 10 percent increased risk of having attention problems at age 7.
The findings bolster previous research showing that television can shorten attention spans and support American Academy of Pediatrics recommendations that children younger than 2 not watch television."
I think as in anything else, it all boils down to moderation.
