I didn't want to as I didn't till 15 months with my eldest (when he went into a low starter bed with no sides as he climbed out of cot bed then). But Devon has had sooo many thick head colds, and he has one of OH's pillows in the cot to elevate his head to help and it's been brilliant for his sleep. He does wander about , but now has switched to sleeping on his front, you just can't keep them on back at this age. Devon is 13 months now. I will get him a proper cotbed duvet set soon.