A.S.
Hi K.!
I have the same problem...the sheets are such a witch to put on! I finally solved my problem by taking a decent sized "snuggle blanket" (a very soft fleece/ flannel blanket) and folding it in half and tucking it under the mattress while it was in the crib. That way any leaks don't get to the mattress, and it is so much easier to change.