For example, British Naturism, the UK's national organization, has a point: "In fact, children are safer in Naturism as children are never allowed to attend without their parents or guardians". This is a critical rule at official clubs and events. Children are always supervised by their parents.
Multiple peer-reviewed academic studies have failed to find evidence that non-sexual social nudity harms children. The available evidence points in the opposite direction. pure nudism kidsl work