Thanks for your query.
Your baby is having gastroenteritis
which is mostly viral in nature and settles in few days.
This is good that he is not showing any sign of dehydration
Maintain hydration by giving oral rehydration solution sip by sip after each stool,give coconut water,lemonade,curd,rice porridge,boiled potato.
He appetite will resume slowly.
Wishing your baby good health.