After some advice please on feeding my 6 week old baby in the night

My baby has recently started sleeping through the night. He’s 6 weeks old. Roughly about 11pm-5am. He’s gaining weight fine and they’re happy with his gain. He was 8.4 when he was born and he’s now 11.6!

But anyway I’ve ready on here I should be waking him up to feed every 3 hours. Is this true?