Do Newborns Need to Have Their Hearing Checked?

My baby is 45 days old. The initial and follow-up hearing tests were conducted on the third and 42nd days after birth, respectively, and both ears did not pass. I am very worried. What are the common causes of this? What should I do?
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Do Newborns Need to Take AD Calcium?

The newborn was born at 40 weeks + 2 days and started taking one capsule per day from the fourth day after birth. Only until the 32nd day did I realize that I should have started taking it 15 days after birth. Will there be any problems if I took it prematurely?
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