Hello there, Ideally speaking cough and runny nose should not be left untreated for such a long time. These are symptoms of upper respiratory tract infection. In runny nose, the infection trickles down the throat and can lead to lower respiratory tract infection as well. This becomes more difficult to manage. So administer Nasivion P drops in both nostrils along with Robikid or any mucolytic oral drops to drain out the mucocus and help in clearing the infection. Have your child had teething problems before ? Babies who otherwise stay comfortable during early tooth eruption are unlikely to have teething problems later. So first treat the upper respiratory infection first. Take care.