Easton is 3 weeks and 3 days today and he's always smiling in his sleep and yesterday he let out…

Easton is 3 weeks and 3 days today and he's always smiling in his sleep and yesterday he let out some actual giggles he's holding up his head and looking around for long periods of times and he's been rolling half way over already when I lay him on the floor it scares me so bad should he be advancing this fast ? Anyone else's baby's do this my doctor says he shouldn't be doing any of that till he's 2 months or older