Good day everyone! Could you please tell me what I can do about a coug…

Good day everyone! Could you please tell me what I can do about a cough in a 3-month-old baby? The cough isn't the kind that happens when phlegm drips down the back wall. It's a wet cough even. We're going to the doctor on Monday, I thought we would get the vaccinations but if there is a cough, it seems like we might postpone them ?