How to Prevent the Onset of ADHD?

My child’s grades have not been good since first grade in elementary school. The teacher says that during class, my son is constantly moving around, unable to sit still for a moment, and he doesn’t pay attention to the lessons at all. We are worried that he might have ADHD. What should we do to prevent the onset of ADHD?
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How to Prevent the Recurrence of Pediatric Asthma?

The baby, aged 12 months, developed asthma after a week of coughing without timely treatment. Recently, with the change in weather and the arrival of cold air, the baby has been experiencing coughing and runny nose. The cough syrup given has not provided significant relief. How can one prevent asthma from recurring at home?
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