Thank you for your query.
Do not panic.Stop milk products,fruits,juices,wheat products for a while.
give nusobee casein
milk for a while. After he recovers give him cow's milk.
In the meantime give him a probiotic
syrup along with yogurts.
Hope this answers your query.
If you have any other queries kindly direct them to me.
Wishing a speedy recovery.
Have a nice day.