She is 2.2 and is in the smallest cot I could find because we lived with my parents when she was born and there was only just about space in my room for a really small one. She has started being unsettled at night and I keep hearing her turn over and bump into the sides of her cot so its probably time to move her. Obviously a single bed would be most cost effective as then she would have the same bed for years and years. Then I could buy a rail to attch to it to stop her falling out? But most people seem to go for toddler beds or cot beds then take the sides off so is this because they are lower down so less distance if they fall out?