My DS2 is 24 months (turned 2 on 8th April). He has about 15 words, but does not put 2 words together. The words he has are mostly approximations or part words, but we can understand him & so can others who are listening closely IYSWIM. He communicates well, asking for what he wants by going over to the thing/taking us over & reaching out with his hand open, making a noise. He also shares his toys with us, reacts to our emotions (laughing, smiling, sad) & looks at us when unsure of something.
He does squeal a lot, but I wonder if this is frustration in not talking.
So, anyway, I am aware that he is behind for his age & am trying to be proactive about it. We have just started attending a 6-week group speech therapy. The first week he did OK, the second week (this week) he did really well & came out with 2 new words 
He is also starting nursery 2 mornings per week soon, as I think it is a good thing to do from 2, & I wonder if it might help him to be away from Mummy who understands his requests before he has made them!
I have also booked a GP appointment to ask for a referral for a hearing test. BUT, I am nervous that the GP will just brush me off & I want a hearing test now so that we can rule out any problems in that area, or deal with them if there are some. The GP I am seeing is not the best one in our surgery, he is very old-fashioned & says 'wait & see' to everything. So, my question is, what do I tell him to get a hearing test? My DS has never suffered with any ear infections that I know of, so I can't give that as a reason. Should I mention the speech therapy group? It takes 2 weeks to book a non-urgent appointment here so I want to make the most of it! Also, one of the other mums at speech therapy said her DD (2.5) has been diagnosed with glue ear, but they are waiting & seeing for 3 months before they put grommets in. Is this common. She feels it is delaying her DD's speech further.
Any thoughts would be helpful, TIA 