The United Nations agency, issuing its first such guidelines, said under-fives should also be physically active and get adequate sleep to help develop good lifelong habits and prevent obesity and other diseases in later life.
More than half of all countries likely to fail in reducing early deaths from a quartet of chronic diseases by a third before 2030, researchers say.
With richer nations enjoying an increasingly comfortable, sedentary lifestyle, the study says a third of women and a quarter of men worldwide are in the firing line for killer conditions unless they up their physical activity.
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