1. What is whooping cough in babies? Whooping cough in babies is an infectious disease caused by the bacterium Bordetella pertussis and usually occurs in early childhood. The virus spreads through droplets, and patients will experience symptoms such as persistent cough and difficulty breathing. In severe cases, it may lead to serious consequences such as lung infection and respiratory failure. 2. What are the symptoms of whooping cough in babies? 1. Paroxysmal cough: Patients will have frequent and severe paroxysmal coughs, each lasting for a long time, sometimes even up to 1-2 minutes. 2. Difficulty breathing