C.G.
I have learned that some children just take a little longer and others learn a little differently. I agree with talking to the parents because they may have been concerned about this themselves and not had the proper information on how to handle it. you are in that sense the professional with experience and knowledge, not out of line. i am a strong supporter of using sign language as a bridge to the spoken word. It worked wonders with my daughter. there are many wonderful dvds(Signing Times) and books available for parents who don't personally know it. This could be a good lesson for all your students/kids and a way to include him into the group.