I agree with Wonderwiper...there is not much else you can do at this point. The teacher will raise the concerns for sure if there is no change when he starts school and parents will probably take it more seriously then. I feel your pain. I have a just turned 2 year old who is just starting to talk now...but it's more repeating words and he doesn't use many of them in a meaingful way to communicate...he can only point to 2-3 body parts...he often doesn't seem to understand at all when I ask him to do something...I will say "Put the book on the table" and he looks blankly....I repeat and the 18 month olds do it for him...or they point to their body parts when I ask him, but he cannot/will not. Parents are not realy concerned and think he will outgrow it and they may be right, but it is at least worth getting assessed in my opinion to be sure. It's really hard when we see things but parents do not take it seriously. That is one of the hard parts of this job because in the end, they make the decisions for their child, not us