A 2-year-old child is brought to the pediatric clinic with delayed walking, bilateral bowed legs, frontal bossing, and poor growth. The child was exclusively breastfed without vitamin D supplementation from a mother who wears a full veil, lives indoors, and avoids dairy products. On examination, the child shows the clinical picture marked **C** in the diagram, with rachitic rosary, Harrison groove, wrist widening, and genu varum. Laboratory investigations reveal 25-hydroxyvitamin D of 6 ng/mL (normal >30), elevated alkaline phosphatase, and secondary hyperparathyroidism. Which of the following is the MOST appropriate initial management for this child?
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