#AskTheExpert hello my baby is 3.5 months old . Nowadays she have a little cough & running nose. What I do?

A. hi dear Most runny noses are caused by viral upper respiratory infections — or colds, as most people refer to them, says Navsaria. “Influenza and other specific respiratory viruses, such as respiratory syncytial virus (RSV), may also cause a runny nose,” he notes.