I have bronchitis bad and my not even three month old is showing signs! My 4 year old has a cough. We are trying to keep everything sanitized help!?

Pediatrician. If your child/children has been coughing nonstop, short of breath, has fever or has been sick more than 5-6days with no improvement-have them seen by their pediatrician.Good handwashing helps minimize infections spreading, but breathing near them increases the risk also.
See below. Your children, especially the 3 month old needs to be evaluated.