We got so much advice on how we should handle the sleep of our baby daughter and we didn't follow any. The first weeks, she was sleeping close to 20 hours a day, which gradually became less. But she showed no real day-night pattern. Also when she was a few months old, we didn't put her to sleep at a fixed time, as it was advised, as we still had a socially active life and just took her everywhere we went. When she got about 9 months old, she suddenly began to want to sleep at 8:30pm and woke up at 7. We didn't pressure her, she just showed us that this is how she likes it and she still wants to sleep now that she is 13months old. So our opinion is: you can try many things, maybe you change something. But in the end, the kid regulates itself if you let it.