Dear Parent, is it associated with other symptoms like cold/high grade fever/vomiting/sore throat/tiredness/breathing difficulty,etc??? Is he able to sleep last night or awake due to coughing?? What about general condition/ food intake/urine and stool pattern/activity??? After all this history need to check physically..
Next Steps
If no to all above than you can try some home remedy or regular cough syrup dose as per his routine doc advise.
If yes than need to consult your doc...
Health Tips
Warm water gargles if possible
Warm water intake by sips 3-4 times a day
Warm milk with dried powdered turmeric
Frequent hand washing
Less touching of hand to mouth and nose except taking food
Plenty of liquids intake
No outside and cold food
Avoid visiting crowded places...
Have a health day further.....