M.L.
As only a 5 week old baby, especially if an only child, there is no way of telling when she will want to eat last at night or how long she will go. The nice thing is that they can't tell time so it is simply whenever you and her get around to it. If you want to make a bedtime routine just start... when she gets hungry at night, feed her, then always do the same thing after that, whether it be a bath, or story, or whatever, then as she starts drifting off to sleep put her in bed for the night. The older she gets the better you and her will be able to judge about what time all the stuff happens but her tummy is too little to be predictable.