Can a Baby’s Calcium Deficiency Be Alleviated?

A 20-month-old baby is found to have severe calcium deficiency, with an open fontanelle, lack of appetite, night crying, occasional twitching, thin and yellow hair that is more relaxed, and lowest ribs standing out compared to others. Despite taking calcium and vitamin supplements as prescribed by the doctor, there seems to be no improvement. I would like to inquire whether the baby truly has a severe calcium deficiency, what effects it may have, and if it’s possible to improve the condition.
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