Suggest Treatments For Frequent Bowel Moments And Less Growth In Child

Hi doctor My two and half year old passes stool after every meal..he iz one of the twins.the other twin is perfectly fine..this problem.started when he was six months old and had a bout of diarrhea and was diagnosed with lactose intolerance..for six months he was on soya milk and after that he stopped taking milk..we got tge test repeated and it was negative.but ever since he keeps passin stool after every meal..at times 10 stools in a day..stools are generally well formed..v have got him tested for celiac disease as well.and it was negative...other wise he is a very active child..the problem iz that hez not growin well..weighs 9.2 kgs and height 82 cms.birth weight was 2.4..also he eats very well..rather is very hungry always n askin for food..we deworm him regularly and have also got his sugar random done.which waz 99.he iz a very active child.but what worries me is why isnt he growin well..please help