I don't think we ever really did any sleep training, we just went with the flow for both girls.
DD1 was the baby you could put in the basinette and she would talk for 5min then fall asleep, as she teethed and got older it became more apparent she wasn't as willing to sleep on her own.
Sometimes we had to just let her sook a little, other times she went to sleep straight away.

DD2 we figured from the start was different, she fed to sleep, had a horrible witching hour right around dinner time that required full attention from me or my boobs and would often be fed to sleep on my bed then moved into her cot.
That worked for us and she started to figure out her own 'routine' as such once she started crawling & walking - this was a big turning point in her entire attitude in general (as you've seen).

I think sometimes it's easy to tell ourselves we are doing something wrong but in the long run i think it's a combination of factors - the temperament of the child, the individual needs of the child and how we react to that.

I was a lot calmer the second time round and just figured this too shall pass... i think the girls now have similar sleep patterns BUT DD1 is sleeping in longer than she ever used to (albeit only 7am) so i am hoping that DD2 eventually catches onto this trend.