Hi, If cough persists for more than 2 weeks, we should be cautious and need to evaluate the child. As the child had pneumonia, which itself can cause a persistent cough. The last symptom to settle in pneumonia is cough, which usually takes a week to settle. I would be worried if the child has a fever, fast breathing, chest indrawing, decreased activity and decreased feeding along with cough, even after resolution of pneumonia. There are many causes for persistent cough, some are: Post viral bronchitis, Pertussis, Tuberculosis, cystic fibrosis, primary ciliary dyskinesia, Bronchiolitis obliterans, some cardiac causes like congenital heart disease with a left to right shunt lesions can have Persistent cough. Looking at the history you have given, it seems the child has post-viral bronchitis, which will settle in some time and the child requires supportive care and adequate nutrition. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Nirubhan Bharathy, Pediatrician