Mother's milk is deficient in vitamin d3. There is no requirement of calcium to be supplemented in a term child born at 9 months as mother's milk has calcium. For a preterm child born before 9 months, child will require syp osteogen . Thank you Dr Aditi Birje MD PEDIATRICS KEM HOSPITAL MUMBAI SHREE GURUMAAULI PEDIATRIC CLINIC YOGI NAGAR BORIVALI WEST MUMBAI