PMC8214477_01
Initiated calcium carbonate at 100 mg/kg/day and low-phosphate formula (A: day of life (DOL) 16) and cholecalciferol at 2000 units/day (B: DOL 19). Weaned calcium carbonate to 75 mg/kg/day (C: DOL 23), 56 mg/kg/day (D: DOL 25), and 26 mg/kg/day (E: DOL 29). Transitioned to regular formula (F: DOL 43). Discontinued calcium carbonate (G: DOL 59). Weaned cholecalciferol to 400 units/day (H: DOL 85).
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fig1
At seven weeks of age, she resumed cow's milk infant formula with continued normal calcium, phosphorus, and PTH levels (Figure 1).