Our girl is 1 yo, and used to go to sleep without much problem at night. However, for the last week, it's become quite difficult.
Here is how it goes : when bedtime comes, we put her as usual in her crib, where she starts to act as if she was tired and ready to go to sleep (lying on the mattress, and holding her favorite stuffed toys).
We leave the room, door usually still open. We also use a night light. A few minutes later, she gets up, and starts to cry, and only stops when my wife picks her up (it doesn't work if I pick her up). Just being close to her and reassuring her doesn't work either. Then, as she calms down, if we try to leave the room again, the crying resumes. So we stay to calm her, and she begins to play with her toys and with us.
In the end, she really goes to sleep when she is really tired, far behind schedule (usually well past midnight). It only occurs at night, she has no problem for naps.
How can we change this behaviour, preferably without letting her cry (we have neighbours, and the walls aren't that thick) ?
UPDATE : The problem was that she was sleeping too much during the day, and wasn't sleepy enough at night. We shortened the 2 daytime naps to one hour each, which worked.