Thank you for your query,
Your child seems to have chronic diarrhea
and it should be evaluated properly to detect the cause for it.
It may be due to milk allergy
or intolerance to lactose or sucrose.
At the same time chronic infections like giardiasis
should be ruled out by doing stool routine examination and stool for culture to detect bacterial causes.
So consult your Pediatrician
to evaluate the causes of chronic diarrhea and the proper management.
Hope I have answered your query.