I separate until they are on one nap a day. Then, depending on well they sleep, they go together, so about 15-18 months. I have one who co-sleeps at home who is still on her own (just turned 2). I am going to try her next week as she has been improving steadily over the past month and is quite keen to sleep with her friends.

My other ones all start out together. Two are great, lie quietly, good sleepers, etc. The other one is a flipper and flopper and needs to wiggle her way into quiet. Some days are good, some not. I give her 15 minutes to settle and then if she is still struggling to settle I will move her to her own space. These are all newly 2s and are all on cots.

It isn't ideal, as I would like to have then all together, but I do have the space to separate if need be.