DD was in her cot until a couple of months before ds was bron,so almost 3 (tbh she was quite happy in it but we needed to get her used to her bed and free up the cot before he arrived). DS is now 18 months and seems to be attempting to climb out of the cot, he keeps getting hhis knee stuck through the bars as well. He just seems too small to go into a bed, plus I'm sure he will be in and out of it constantly. Has anyone done it this early(or isn't it early)?