new sleeping patterns

my 8 week old has been asleep for 7 hours straight and counting. He's always stayed up all day and slept through the night but usually in like 3-5 hour blocks. Should I be concerned? He's been gaining weight well since birth (he's now about 13lb 5oz and is 61cm) and has had his usual number of wet nappies over the last couple of days. I'll obviously be pleased if this is the new normal but I can't relax for worrying and my boobs are aching something rotten too. 😂