The Princess of Wales is warning that smartphones and other digital devices are playing a key role in an "epidemic of disconnection" that threatens the development of young children.

"While digital devices promise to keep us connected, they frequently do the opposite," Kate, the wife of heir Prince William wrote in a joint essay with Professor Robert Waldinger from Harvard Medical School.

Kate, who has three children - Prince George, 12, Princess Charlotte, 10, and seven-year-old Prince Louis - said the challenge was "particularly acute" for babies and young children born into a world immersed in digital technology.

In an interview with Eugene Levy for the actor's travel show that aired last week, her husband William said none of their children were allowed phones.

"We're raising a gen

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