This is a good question with all the necessary information. Your son’s habit about biting on his shirts is probably just that,a habit. He seems to have picked this habit up at school by copying the other children at the school. Like all habits the more that you mention it, the more it carries on. Your son does not appear to be an anxious boy at all. This habit will just stop with time and especially when his attention is not drawn to it so often.
It is important to get his nose to be clear. It would be most unusual for his adenoids to grow back twice. It is more likely that he has an a nasal allergy causing him to have a blocked nose. This requires diagnosis and treatment and I would strongly recommend that your son is seen by a paediatric allergist about his blocked nose. There are experts in all the main centres in SA.
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