I took my son to the doctor yesterday because he has a cough and he seems really congested the…

I took my son to the doctor yesterday because he has a cough and he seems really congested the recommended I get a booger sucker and some saline I've been using it and it seems to be helping but now his cough seems like it got worse , he's 2 months old has anyone tried anything that helped their child this little with a cough? Please let me know!