You decribe your son's cough very well indeed. The most likely cause of his cough is the result of his recent pneumonia which was probably caused by a virus infection. His present problem is known as 'post-viral airway reactivity'. This usuallytakes quite a while to settle. It would be best to speak to your paediatrician and ask him/her to put your son on a medicine called Singulair for about 2 to 4 weeks.
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