Hopeful sign?

I have noticed another way to understand Little Prince. I have noticed that when he is happy with what we are doing for him, he makes a certain sound. It is the same one every time. It isn‘t a lot, but I have had him attempt to let me know what he didn‘t want by pushing my hand away and now we have a sound when he likes something. He still can‘t tell me what wants by naming it but he can let me know when I have it right and when I have it wrong. That is something; right. Or maybe I am the mom of an autistic boy desperate to cling to any sign of communication.