Thanks for your query.
Your child is having enteritis
which is usually viral in nature and takes few days to settle.
Most important is to maintain hydration.
Continue with nutrilin B.Give oral rehydration solution sip by sip after each stool,coconut water,mashed banana,boiled potato,curd,rice porridge.
watch for features of dehydration
,decreased urination,increased thirst and in case you find any get him evaluated by pediatrician
Wishing your child good health.