Yes! We are going through this at the moment too. DS wnt from sleeping a good 6 or 7 hour block to waking every three hours for a bottle. I think it might have been hunger and thirst, because he's been drinking less during the day. But I've also wondered if it might be a developmental thing, so very interesting that your bub is waking more as well.

Because DS has been happy to take his bottle during the night, we're just feeding him and he goes back to sleep (but he's in bed with us).

Sorry I can't really offer any helpful advice, but perhaps it's a common thing at this age and hence one of those things that will just pass?

Best of luck with getting back to a better sleeping pattern soon.