My guy gets lots of mucus when he is close to cutting teeth. I was convinced he had a cold because he was coughing and had a runny nose and then I remembered when he cut his first two teeth close together he had a terribly runny/congested nose. Always clear though. And this time it was when my hubby said he was drooly that I realized the coughing was him adjusting to being super drooly again when he was laying down. So for us clear mucus, low fever, increase in saliva, more coughs = tooth is serious about coming out this time. We use the Boiron liquid teething stuff. My poor little guy is working on 4 at once right now, eek!
Mama to 3 year old DS and awaiting #2 in June