Anyone got a good recommendation? I've seen some that look lower than others and I want the lowest possible? Also when did you all move them to a toddler bed? My little boy will be two on July 16th and my new baby will be due June 26th, so ideally I'd like him to be in it by then so when it comes to it I could re use my sons cot. It seems a waste to buy another for the sake of a few months