11 weeks and sleeping ..??

Hey there, 
My son is 11 weeks and still doesn't sleep very well at night. The most he'll do if I'm lucky is 3-4hrs a night. And it's so inconsistent. I never know what I will get. He also started poorly sleeping during the day (ill get him to sleep twice a day for an hour or more (depends on him of course) and the rest of the day it's between 24-45mins. He averages about 6-7 naps a day. 
He's my 1st so of course I don't know what to expect and how it all should be.
Any thoughts? Thanks! :)