Hi dr my daughter 2 yrs old was suffering from frequent diarrhoea problem from february 2024 as every month she get ill and get watery stools and vomitings all test done ttg iga test done nothing came stool test report was also correct now sm otger dr told us that she has milk allergy dont give her milk and dairy products only isomil if she ask but dr dont tell us till which age we cant give her sll these things and is this allergy permanent or not so plss explain me and answer me