Hai , what is the age of your son ? Andthe loose stools frequency and consistency? For loose stools if he is not having any pain or any other symptoms please see that u give him adequate fluids to avoid him
Going into dehydration and give him probiotic and zinc supplementation as u were giving him . If it persists give a sample of stool for examination .
Next Steps
Also check why is he having frequent t episodes of loose stools . Check his nutrition status and dietary habits