C-Section baby congested?

I brought my little one to his doctor last week and he said he has some post nasal drip going on so I treated it with saline water and a nasal aspirator. He does this little cough to clear the drip from his throat (poor monkey).

I've been told (and read) that c section babies are more likely to have left over mucous from inside because they didn't pass through the birth canal and it takes them longer to rid themselves of it. Anyone know if this is a fact? And if you're going through it what are some things you've done to help it? (I also use a cool mist dehumidifier)