Sorry, I should have been much much more clear. Many babies do a 12 hour night. But there are many who don't, even thought we often work towards that. Often in those schedules that people are writing, the baby might be in their bed for 12 hours, but may not be asleep for all of it, it may take 20 mins to fall alseep, then wake earlier but stay happily in the cot for a little while.
Then there are some babies who just don't even come close - my lo is one of those, and I know of several others also. Even at the age of your lo, our schedule involved an 11 hour night, not a 12. I would say I aim for 11 now too, but usually I get 10-10.5 and I make her stay there til 6:30am.....
Right now, Zara is getting as much in 24 hours, as some babies are getting overnight. They all have different sleep requirements.
The way to judge wether the night needs to be longer, is your babies cues. Are they happy when awake. Are they doing full a times during the day, and napping OK. If the answer to all of this is yes, then it is quite likely that your baby is getting enough sleep. If not, then you need to keep working on it.
I believe as babies get older, they will learn to lengthen their nights to make up for a busy day, or less day sleep (kind of like adults do). I think this probably doesn't happen until around 2 years old. A few things I do so that Zara will sleep longer if she needs to are:
1/ don't feed immediately upon waking (unless she had one of her rare nights). I have a time in the morning that breakfast is, and we try to make it as close to there as possible.
2/ I don't wake her early. if she wants to sleep a bit longer, I am all for it
3/ I try to keep her in her cot, even if awake, until her "get up" time.
So I guess, in summary, 12 hours is a goal. If your lo doesn't do that, but is happy and seems well enough rested to you, then go with it. I spent ages stressing that my lo didn't sleep 12 hours, and that something was wrong with her schedule. But the reality was, she didn't need it, and all I was doing was stressing myself out.
Sorry, I should have said so much more in my original post.
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