Quick development & my 6 week old!

My little boy is 6 weeks and he already coos, smiles at me, makes full eye contact when I talk to him, can roll from belly to back, has found his own hands and sucks on them, and has incredible strength in his neck and legs. These are all things he typically wouldn't do for a couple months! I did carry him until 41 weeks...wondering if that has to do with it! Anyone else's baby developing quicker than average?