My dd is 7 weeks old and has been a solid night sleeper since week 1. She sleeps through the night -- I mean 5-8 hours straight. She sleeps in a cosleeper. On many nights, though, it's hard to help her to fall asleep. She gets so relaxed and even is asleep but repeatedly startles and wakes up and then we have to start all over -- this is the case no matter if she gets to the sleep place by nursing or by rocking or walking, etc. I was thinking we were missing her sleep window and she was overtired so I started trying to help her sleep for the night earler and this worked sometimes. Another thing that might be a problem is that she has a gas bubble in her tummy that awakens her -- she has quite a bit of gas related to eating and often she nurses to sleep. One night the only way we could help her sleep was to go for a car ride. I feel like she needs something from us to help get to a real sleep but I don't know what it is and so it feels like fumbling for hours every night. Maybe we just need more time to learn her, but I'm open to input.