my niece is 2 yr 7 months old she has persistent cough (URTI) since August 2021 first she was given syp relent+ and syp coscopin then next month September- syp ascoril and syp azee as she had one episode of fever 100 , which got relieved on taking dolo, then also cough not releived .. then in October syp Montair was given for 15 days then in November she had nasal discharge too so syp resway and tab cefcloud was added on doctor added syp augmentin and syp levolin and nebilization with budesonide and levolin her CBC reports are normal & cxr also N what the probable diagnosis why her cough is not improving ?