It is so hard to know what to do isn't it hun. Izzy will be 16 1/2 mths when our little man arrives, but he will be in a cradle for around 3 mths. So when Izzy is around 20 mths we are going to move her to a single bed. I looked at toddler beds but it just seemed a waste really so we will use a normal single bed and put a rail up on it. figure that once they are in a "bed" it doesn't really matter how long it is IYKWIM? I am going to get DH to cut the legs on the single bed that we have and make it a bit lower to the ground and she can use it for years to come! HtH! Ikea also have beds that can adjust from toddler length to single bed length - I think they are worth looking at too if you don't want to go right to a single bed.