Baby sleep!

I thought being exhausted was a new part of parenthood, but then I started talking to friends with young babies and I was shocked to find out their babies were sleeping through the night! I did a little reading and talked to my sons doctor and found out sleeping 5-6 hours is normal at 2 months (how old my son is). What the heck! He is already 14 pounds, eats 30 ounces a day (I exclusively pump), and goes down without much fuss...he just wont stay asleep for more than 1-3 hours at a time. Do you have any tips?! Between pumping all the time and taking these little naps all night I'm feeling desperate!