hello doc my daughter is 6yr old. she had not fallen sick for past 3 yrs and now she is frequntly fallin sick. getting cough throat pain stomach infection. what to give to increase her immune system as aftr school started she started falling sick.. she is 19.8kg. stable past 1 yr she isnlean..active child but she gets tired aftr playing little also. her legs also pain frequently.pls help. TheExpert