My son age is 1 year 3 months and he is suffering for cough problem after his birth. what i am doing now ?

Depends on cause: The are numerous causes of chronic cough in children (reflux, asthma, allergies, infections, recurrent upper respiratory infections.) A pediatrician should be able to point you in the right direction as to the cause. May need some tests and a referral to the pulmonologist or allergist. It really depends on the history of the cough.

?reflux: If he has had a cough right since birth there could be many reasons.is it GE reflux?is there smoke exposure?are there pets?talk to his pediatrician