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How can I cut down crib bedding to mini crib size? - mini crib

I bought a mini-nursery and Emily could not find bedding that I liked that the mini-crib justice to, I found regulation-size beds for sale and purchase, hoping that someone could help w / the "how to" cut (stamp sheets and blankets for babies) to adapt the mini-crib. I have 1 sheet that the crib can I use it as a model that matches?? Help I'm a little confused!