We gave up trying to get James 'down for the night' when he was little as it would just end up in a very disappointed Mummy.
I used to leave him in living room with OH whenever he fell asleep in the evening and go for a snooze myself. Then I was OK to do the night shift.
Newborns have no concept of night and day and no concept of routine so you pretty much do what you have to do.
Once James got to 6-7 weeks we started 'bath, bottle, bed' and from 8-9 weeks James has gone down for the night - *touch wood* I've only once had to get him up for a poo change..... Other than that he has remained in his crib / cot-bed until morning.
He literally went from sleeping just a few hours and being upset to be put in his crib to being fine and having a good 6 hours + a night!!! He now sleeps at least 9 hours a night although I may have to get up a few times to soothe him if he gets restless.
I think letting them figure out their own routine helps?
I never woke James from daytime naps, I always made sure he had a good feed before putting him down for the night and if he woke I would soothe him, pop his dummy in etc but I never engaged him fully or anything like that. For some reason we've only ever had one night poo since he was 2 months old? So we have been lucky but yep I certainly wont wake him up for a wet bum.
Just to add when he was 11 days old poor Mummy didn't know if it was night or day
it took a while to get into the swing of things.
xxxxxxx