Thanks for follow up ,
rickets is general disease , not cause only in Vit D. It can be deficiency of
proteins, iron, vitamins, problems with absorbtion of calcium in intestine, some vorms (lamblia)can prevent absorbtion. Thats why i recommmend additonal examination-
blood test for
hemoglobin, Calcium,Phosphorus, albumins and general protein, stool analysis for ova and cysts, for digestion function at least.I hope that your child drink at least 1000 IU of Vit D3 together with calcium,because without Calcium you will not receive result.In addition your child should eat natural Calcium-spinach, sesame seeds, panir, dahi, milk, cheese.Also you add multivitamin-
zincovit 1 teaspoon 1 time 1 month, give to him lots apples or natural apple juice, its helpful for legs. In most cases children start walk straiht and you will never suspect rickets.
Take care