Whooping cough (or pertussis) is a highly contagious respiratory infection caused by bacteria. It can affect babies, children and adults. For adolescents and adults the infection may only be a persistent cough, however for young children whooping cough can be life threatening.
Being a big sister or brother is for life is so important and the first visit has a lasting impression on young children. I encourage you to talk to your child about being a sibling and to introduce the new baby as soon as possible.