Due to all of the antibiotics Luke has been on, he has a pretty bad diaper rash. One of the biggest suggestions for treating it is to let him air dry as much as possible. We bought a waterproof mattress pad to lay down in his crib over the sheet so that he can play in there - diaper free - and we don't have to worry about it. Tonight after his bath we put him in there to do just that.
An important lesson that we learned - the waterproof mattress pad does nothing when the little boy stands at the crib rail - and pees out of it.