hello! my toddler is suffering from cough since a year .6 months back he suffered from pneumonia and after that treatment he was completely fine .Then again now within every 4 days he s suffering from wet cough.i usually use inhaler and sometimes cough syrup but it reduces for sometime then again if weather changes cough starts. and usually he gets cough when he s asleep then he wakes up nd vomits. what is the reason behind this why my child Is always having cough he becomes so weak but it s not even contagious.