Adenoids and speech delay?

My 19 month old had his speech evaluation yesterday, and the evaluator noted that he always seems to have his mouth open and drools a lot. She said it could be a sign of an adenoid problem, which may be a factor in his speech delay. I have also noticed he is always noticeably runny/stuffy. I will definitely bring it up at our npediatrician's appointment next week, but I was curious if anyone here had heard about/experienced a connection with adenoids and speech delay. I'm not looking to rush into an unnecessary surgery, but if he's really having a problem due to his adenoids, then I certainly want to do whatever I can to help him. Thanks so much!