Hi please furnish all the details about your son's case and we will see what that we can do.
Homeopathy is best for children and definitely his cough can be cured , but for the examination and check up is definitely required.
Homeopathy does take time and in few cases it can take a couple of months especially if it is chronic.
Next Steps
Do book a consult for your son at a clinic for a detailed case taking and check up
Health Tips
Hope your avoiding raw ginger garlic onion coffee or any Coco related products while giving homeopathy treatment your son . Also avoid curds, citric acid products oily, fried , cold, cheesy, creamy food items. Avoid polluted and public crowded places .