Children lacking Vitamin D can manifest various symptoms of rickets due to calcium deficiency, including pigeon chest, beading of the ribs, X-shaped legs, O-shaped legs, and square skull. As long as these are identified early, by supplementing with Vitamin D and calcium and ensuring comprehensive nutrition, children can return to normal growth and development. With age and appropriate physical exercise, these skeletal abnormalities can gradually improve and generally do not leave lasting effects.