Thanks for posting your query.
Let me know the other associated symptoms along with watery shit.
As a child is progressively growing up, ability to digest lactose is progressively decreased.
may be congenital or may be due to gastroenteritis
Lactose intolerance due to gastroenteritis is short acting.
You should consult with internal medicine specialist and should go for thorough check up.
You should avoid milk and all milk related products such as cheese, yogurt, butter.
You should take proper antibiotics for rapid recovery.
Dr. Mayank Bhargava