my son 4.7 years old, I can see a little difference in the size of his breast very little, it's that normal

A. Mam in what way can you see a difference in the breast of your son can you please explain because this is very difficult to understand what is the exact situation like so if you don’t mind can you please share a picture otherwise if you feel that it isn’t correct then in that case I do recommend you to kindly take an assistance with your doctor physically