I have a 3 year old DS who still sleeps in a cot and another due in January. We are borrowing a snuzpod type thing for newborn which should be good for the first few months after which it can have the cot and DS will get a proper bed. In the longer term they will most likely be sharing a bedroom for a good few years so we would want bunk beds. In the interests of being cost effective does anyone know of a single bed that can convert into a bunk bed at a later date? I don't really want to buy the whole bunk bed now as we may move house or get an extension over the next few years, meaning they wouldn't necessarily share a room.