Children with Down's Syndrome are very susceptible to developing chest infections especially pneumonia. This is what has happened to your son recently.Downs children are very seldom allergic so this is not usually a problem.It is very difficult for your son to cough properly so as to clear his chest of mucous. This is why physiotherapy is essential and must be continued until he clears up.You can continue with all the medicines and the nebuliser, but the main treatment for him is physiotherapy.
Your son's thyroid results seem to suggest that they were slightly higher than expected [top range of normal values] but not at a level that would be any cause for concern.
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