My son is now 2 weeks old !

Does anyone wake their baby to feed.? When we got home from the hospital I had him on a 3-4 hr feeding and would wake him to feed (formula). He has a drs apt tomorrow so I am going to bring it up to his pedi , but for his 630am feed he never wants to wake up. He loves his sleep. I know they say if hes gaining weight, let him sleep.. I wanted to try it today, so I did not wake him for his 630am feed. It is now almost 9am and hes still sleeping ! How long do you let them continie sleeping.?