Rolling from back to belly

Ashley
My son will be 3 months old on the 22nd and he's already rolling from back to belly. He can't roll from belly to back yet, won't lift his head in tummy time(but will with a tummy time pillow or if he's laying on me). But you put him on his back and he flips himself over! I'm just in shock at how much he's growing! This seems to have happened too quickly