Hello. I am a newbie. My son (my first born) was diagnosed with CF at 3 months. He is now 6 months. I think he is trying to cut some teeth. Being a new mother, I don't know what the symptoms of teething are. I have read websites about it and noticed that a runny nose is a symptom. My question is, does his CF cause it to be excessively runny. His is very runny and dripping. Is anyone else going through this to give me some advise? Since this is the weekend his Dr isn't in, I plan to call tomorrow.