What Are the Symptoms of Nasal Congestion in Premature Babies?

I would like to inquire about the symptoms of nasal congestion in premature babies and their impact on children. A one-month-old premature baby was told by the doctor yesterday that he lacks vitamin D, so he was given an injection of vitamin D nutritional medicine. Now he is two and a half months old, and he was born at 35 weeks and 6 days.
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