My girl is 5 weeks old and her days are still very inconsistent there is no pattern at the moment.
I like to try and take her upstairs at 9:45 and give her 'last bottle' and get her down for the night by 10:30 but it all depends how much she's slept in the day!
Yesterday she slept most of the day, didnt have much awake time at all, then was doing typical witching all evening, she fell asleep at 10:40 but then she woke back up at 11 until 12
The evening before she'd been awake for much longer periods throughout the day, and by 9:45 she was zonked out in the moses basket and didn't wake until 3:30 for a feed. It felt glorious.
The thing is when she's asleep in the day, there is no waking her. She will sleep through a hurricane. I can pick her up and sit her up on my knee and she'll still just stay asleep. Or if I change her nappy she'll wake up, but then start crying and immediately need comfort (dummy/milk/rocking) cus she wants to go back to sleep.
I tell myself this won't last forever, just gotta ride the newborn wave and wait for a routine to settle in!