DD1 was 9lb 13oz at birth, after a difficult and very much (as far from a "natural" birth as a vaginal delivery could be) medically intervened vaginal birth, was fully/exclusively b/fed from minute 1.
She slept through the night from 11 weeks old. Completely. Not a single stir from her all night. Has slept through very well all her young life and is now 5 yrs old.
DD2 was 8lb 12oz. She was a much easier, low/no intervention birth (although I had PE and was an inpatient to be induced). She cried from minute 1.
A total struggle to b/feed. She first slept through the night regulalry at 10.5 mths.
You are searching in vain until you can find a way of determining child characteristics nad how to deal with them appropriately
Now, as for co-sleeping and not 'giving in' to babies 'demands' for attention in the night leading to 'bad habits' - that is utter bullsh*t. There have been a few studies that have found children that co-sleep etc develop into very well adjusted young toddlers through to young adults. No studies have found that this has made children more clingy or such-like.
It's a Victorian fallacy I am afraid. And as for controlled crying, it should discarded along with the Victorian idea of assylums, making babies sleep outside - whatever the weather, and sleeping on their stomachs.
But that's just my opinion.