My son (3) has had a runny nose for most of his little life. He has only had 1 ear infection at 2 1/2. My pediatrician said that he could have enlarged adnoids which could result in congestion, runny nose etc. When I was a kid...they removed the adnoids (mine included)...but the thinking has changed...and unless it's affecting their sleep to the point where they are sleepy throughout the day, can't concentrate etc...they leave them alone. The adnoids (from what I am told) will decrease in size as the child ages....and become no longer a problem. I know the constant runny nose gets really old really fast. Hope you find some answers.