@linka81 Stayed pretty frequent until they night weaned, which was around 2 years old. I bedshared pretty much until then as well. It kind of bounced between hourly to 2-3 hourly to 4-5 hour stretches with no kind of pattern or sense to it, I learned to go with the flow after a while
It was also difficult to know whether we had actually been awake because I was bedsharing and by that stage feeding half asleep is second nature.
Currently feeding my third who is 10 months old and he sleeps the best of them so far. Only wakes 1-2 times a night to nurse and doesn't even always want that, often he just wants to nuzzle into (mine or my husband's) armpit.
It is normal for babies to wake up throughout the first year and beyond, some of the breastfeeding specialists or AP focused sleep specialists have done informal surveys on this. Anecdotally, formula is said to decrease night wakings but surveys seem to suggest that it only decreases parental perception of night wakings, as in they wake up the same but when you're asked to report how much they woke, formula feeding parents report fewer wake ups. That doesn't mean they slept through them. They just report fewer. It's weird because you'd think that you'd remember getting up and giving a bottle.
I wonder whether the difference isn't so much what they're being fed but the parents' motivation to make changes. I never did anything big to night wean because the night feeds weren't really an issue for me. Now with number 3, that's different, night feeds are no big deal, but co-sleeping is beginning to be a safety issue because he wakes up and silently explores the room, which my others did not do. So we are currently transitioning to a cot.