Thanks! I did not make myself clear. He won't be able

to get the birth certificate for a while because his HuKou is lost somewhere. His parents are old and officials are usually beauracratic. We would be lucky if he finally gets his birth certificat in half a year. That's why we are worried if I submitted 485 but he could not because of lacking of birth certificate, then he way have to wait for 5 years since the PD for family based GC is so backlogged.