A 7-year-old boy from rural Bihar presents with progressive bowing of legs, delayed motor milestones, and dental enamel hypoplasia. Biochemistry shows serum calcium 7.2 mg/dL, phosphate 3.1 mg/dL, alkaline phosphatase 680 IU/L, and 25-hydroxyvitamin D 12 ng/mL. X-ray confirms metaphyseal widening and loss of sharp metaphyseal margins. What is the most appropriate immediate next step in management?

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