Hi Welcome to the HCM In my opinion your child seems to be suffering from an episode of viral gastroenteritis. In cases of diarrhea, body of an infant may temporarily have trouble producing lactase, and he may have symptoms of lactose intolerance for a week or two.This seems to be the likely cause of your baby s poop change. Don t worry. You can take the following measures to help him: 1. Hold milk and dairy products containing lactose for 1-2weeks. You can give him lactose free milk formulas for the time being. 2. Keep him well hydrated during these diarrhoea episodes by oral rehydration therapy such as lemonade, soups, Buttermilk or oral rehydration solution. 3. Start a syrup zinc for next 2 weeks. Zinc help in regeneration of gut mucosa and early recovery from the diarrhoea. Also it gives immunity against similar episodes for next 2-3months. 4. Give him acetaminophen if fever occurs. 5. Probiotics such as enterogermina will be helpful. If still the child doesn t respond, then do contact your pediatrician for proper clinical examination and laboratory work up if required. For further questions, do contact us.