Respected user , hi 
Thanks for using Healthcaremagic.com
I have evaluated your query thoroughly .
* Cause is intestinal infection with some bacteria or virus .
* Remedy include 
-  In our clinic , we recommend Anti emetic syrup ( as ondancetron ) to be
   given 1 hr prior to meals on empty stomach 
   Anti biotics with 
Metronidazole on pack , pro biotics , Zinc formulations ,
   Anti pyretics in certain 
fever range only 
   to give faster recovery .
-  Offer plenty of liquids with oral rehydration salt formulations .
-  Avoid commercials as biscuits , ice creams , cookies , junk foods 
Hope this clears your query .
Wishing fine recovery for your Angel .
Regards .