When you don’t have enough vitamin D it can cause problems with your bones, as they may become weak and soft, and even lead to bone deformities. In adults, this can develop into a condition called osteomalacia, which causes bone pain and tenderness. ##### In babies and children the big risk from vitamin D deficiency is an illness called rickets. This leads to bone pain and deformities and inhibits growth. It can normally be treated through dietary changes, or by giving vitamin supplements, but if you spot signs of rickets in your baby then you must speak to your doctor. Symptoms of rickets include: ##### ##### If they are old enough to walk, being reluctant to potter about or tiring quickly. Or looking like they are waddling as they walk. ##### Poor growth. ##### Teeth problems, such as cavities or teeth not coming through. ##### Deformities, such as thickening of the knees, ankles and wrists, or bowed legs. #####