Thank you everyone for your responses. What you are saying makes senses and yet had nver occurred to me. My son has had a particularly big growth spurt this past year ( 6 inches) and it is noticeable that he has grown into a man. I was thinking down the lines of being aware of his body difference and wanting to hide it, your responses took it to the next level. I had discussed with him my theory of being bigger in that area than his friends and wanting to not stand out and have accepted that this is a phase that he is going through. Based on responses, while I was off the mark somewhat, I plan on sticking to my plan of acceptance, for the time being anyway.
Thanks again for your great responses.