DD was probably 4 before she managed a single night without waking up, and then it really was just a single one. Every now and then she’d throw one in after that to get our hopes up. And she’d wake up by 6 no matter what time she went to sleep.
5 now, and in year 1, and that seems to have helped a lot because we do get much better sleep on the whole. Astonishingly she’s still asleep now and I’m going to have to wake her up, but she probably didn’t go down till gone 9 and woke up twice in the night.
Also, if she closes her eyes for more than 10 seconds in a day it’ll be nearly midnight by the time you get her to sleep that night, and it’s been that way since she was about 2 as well.
She’s an otherwise healthy, thriving child with good routines, really active, eats a good range of food, hardly ever ill, doing well at school etc etc. Sleep has just always been the hard thing.
It’s really easy for people whose children sleep well early on to assume it’s their amazing routines or their methods, something they did or did not do. In reality I think it’s just how some of us are, I certainly found it easier to stop worrying what I was doing wrong all the time and just go with it.