Ours is only a few months old but sleep looking like this:
- Wake up with us around 8am
- Nap on and off during the day (sling if out or popped into rocker if looking tired, basically), usually 2-3 hrs napping on avg day
- Go to bed with us at 10.30pm-11pm ish
- Strict sleep hygiene (blackout blinds, same music toy wound up during final feed, same sleeping bag as have multiple identical ones, no talking in room after light off)
We're now managing that period from 11pm to 8am without wake-up or problems settling.
But I'm nervous our sleep routine might hit a regression or bump, because I was talking to a neighbor who asked how bubs sleeps
She was absolutely horrified that baby is up with us in chair or on our lap all evening & kept up until adults go to bed. Said we're creating problems for future?! Didn't elaborate.
Anyway, after asking in antenatal group chat and reading threads on here, it sounds like babies are normally put down 6om-8pm to bed then up really early, like 5-6am?
Why do they need to go to bed that early?
Is it an age thing? Do older babies and toddlers need earlier sleep?
I'm not asking to be goady or judgemental as one womanin antenatal said, I honestly don't understand why most babies are put to bed so early then up so early. One of the benefits of maternity leave is no 6am work shift alarm 
Can someone explain/should we be changing this by a certain age?