Feeding baby

Hello! My baby is almost 6 weeks and he is gaining weight steadily. We are bottle feeding breast milk and formula. I understand that newborns usually feed every 2-3 hours, and my baby was like that up till around 4 weeks. But now my baby has been drinking about 60-90ml every 1.5-2 hours (total in a day varies between 700-900ml). I'm guessing this might indicate that he needs more milk during each feed to be able to rest for longer stretches in between feeds, but he seems to be unable to drink more than 90ml each feed and would either fall asleep at the end of the feed or reject the bottle (and stomach is sometimes bloated). Wondering if anyone is experiencing / has experienced the same with their little one and how'd you manage? Do I move towards extending the time between feeds? How should I do so? Thank you in advance! 🙏