Baby ia 6 weeks and slept for 5 hrs.

So today my 6 week old has been sleeping for 5 hrs now and is still sleeping. Normally he only sleeps 2 to 3 hrs during the day and 4 to 5 at night. Iv heard that 6 weeks is a time where they growth spurt. I even tried waking him up so I can feed him but he just wouldn't have it was fussy till he fell back asleep. Is he ok? 5 hrs during the day isn't like him. But the day he was born he was asleep the whole time till the next day when we brought him home.