Yes, it’s curable with very good results. Child needs vitamin D and calcium supplementation and good nutrition.
Proper calcium, Vitamin D3 supplementation and proper diet supplementation (High protein and calcium diet) for adequate time will cure it.
Natural source of Vitamin D is Sun light. Parents should promote their children for outdoor activities for maximum sun light exposure. High protein and calcium diet like Milk, Milk products, paneer, Makhana, Banana, Broccoly, sessem seeds, pulses, green vegetables, fruits etc. Avoid all kind of junk foods like cold drinks, pizza, burger, noodles etc.