my experience with my dd who was 6 weeks early and in the NICU for 10 days -- the schedule isn't much different if at all. The docs wanted to give my dd hepB as we were getting ready to leave the NICU (she was still premature at that point). We declined. But, the well baby checks are done based on the actual birth date not the due date so her 2 month appt was technically 6 weeks early and we did vax her then with the recommended vaxes. Then, I did the same thing at 4 and 6 months. Then I woke up. No more. My ds was also a premie - 5.5 weeks early and again, they would have given him HepB before leaving the NICU. He has had no vaxes.
IMO, docs are on autopilot with re: to vaxes unless you speak up.