Can anyone please tell me that at what age should I make my child sleep in a separate room?

Hello, You can start at 2, I think. And if you have more than one child, you can make the little one sleep with her even before the age of two.My friend has two daughters and they both sleep in a separate room. One is 6 and the other one is one and a half. And younger one is comfortable and happily sleeps in the separate room.