I will rock a child for the first few days/week (or if they are parttime I will rock them until they become fulltime...had a few of those). Then, they simply have to get used to falling asleep on their own. I will let a child fuss but not scream. Children who scream get calmed down in their playpen and I'll pat their back until they calm enough to sleep.

But, my day simply isn't long enough to rock every child to sleep and still have a quiet break for myself too. It doesn't usually take longer than a couple of weeks to get into the nap routine...which is great considering most of the kids are/will be with me for years.