The report never stated how the information was collected or measured.
Either way the children are getting fatter and fatter as the generations keep coming. There should be a higher focus made on food choices and exercise (next to athletics - some kids just are made for sports but they still need exercise).
Fat kids have a higher chance of being an obese adult and slender children that eat whatever they want and don't exercise have a rude awakening to face when they grow up to be an out of shape obese adult.