6 week old with Bronchilitis

Well I have officially failed in protecting my newborn DD. My elder DD has been sick and after 4 different doctor visits with finally diagnosed with bronchilitis after it was too late and she had already spread it to her newborn sister who is miserable! I don't know what to do and feel like I have failed to protect her from such a horrid virus ? to top it off I have the worst case of flu which has left me bed ridden! has anyone had experience in bronchilitis at such a young age?