I bit the bullet and had the conversation, partly through email and partly at pick-up. I did not use the word Autism, but did let them know that I am concerned about his overall development and his social interaction as well as some other things like that he walks on his toes and often covers his ears, doesn't respond to his name, follow directions, etc. It actually went really well...I think! Mom admitted she is having a hard time accepting that he is delayed, but she appreciated my care and the kind words I also used to describe her child...because he is really a little sweet heart and a great kid! I think I can now sleep easy knowing I did what I had to and the rest is up to the parents. I will also be trying to find more strategies to help him until he gets professional help. Playfelt, this child LOVES music and will do the actions to any song we have sung with great enthusiasm...doesn't sing yet, but does the actions.