10 week baby sleeps 8hrs per day.

He falls asleep easily, but has a problem staying asleep. During the day he naps for 2hrs maximum in total if I’m lucky. 6hrs or less during the night. Not sure what to do 😩😩During the night he’s usually in my arms so I’m getting about 2hrs of broken sleep per night. It’s been this way since he was 3 weeks old. Sleeping is crucial for brain development and he’s not getting enough so that worries me he’ll be intellectually delayed. Also I need a bit of a break.

Any advice is much appreciated!