Hi Rosieroo and Beanie....
Sounds like it's just a wee blip! Oscar has also been in a fairly good routine, but from time to time, he adopts other ideas!!!! The last week he was feeding 24/7 anf I mean like CONSTANTLY!!!!! I was knackered, but we're back to normal again. I suspect it was a growth spurt. All I could do was sleep when he slept. During day snd night, when I was so tired, I would just plug him in beside me and he chomped and dozed while I snoozed.
I'm finding that BF is getting easier now - I continue to feed him whenever he wants. He only wakes once during the night for a brief feed. HV recons that it's possibly because I demand feed during the day. So don't give up. They have to keep us on our toes!!!!!
Beanie, personally, I would feed Seren. Maybe she just needs a brief top up. She'll probably go back to sleep after!!
Good luck!
Emilia xx