Coughing Baby!

Taneia
My son is 5 months and he has been coughing every night around 3am he coughs during the day but it's nothing like the 3am cough. Its starting to scare me! Doctor said he's to young to get any medicine told me to get a humidifier. I have asthma so I know the feeling I just want my baby to feel better. Is it anything I can do?