I would say he's waking in the night because he's hungry. My LB is 9 weeks old and takes 7 ounces every 2-3 hours (he's a chunky hungry boy haha) and will often cluster feed in the evening. We've gone from waking up every 3 hours to sleeping 6-7 hour stretches at night.
Honestly I would up a feed he might go longer but also babies at this age do still cluster feed
This was the same as my little one (11 weeks tomorrow). I have upped his amount, made sure I am burping him half way through at least and he has been downing them. I also found he has been more settled and had longer naps and more time between bottles, including at night! Yay
Yea he's probably wanting fed every two hrs coz he's hungry. My lil guy takes 4-6 Oz. But also you gotta think from the time you make the bottle and wait for it to cool off and then he take it and then burping him and changing him if he needs it, cuts into that 3hr window