Nestig Wave MINI Crib Mattress Waterproof Covers 2 pc and Handmade Muslin Crib Sheets 2pc made from cotton muslin swaddle blanket/large sized baby crib sheet The covers were bought for 55$ each on Nestig website, swaddle blanket for 10$ and large sized crib sheet for 15$ on Amazon. All the stuff is in excellent condition, and was washed one or twice just for freshness. It was never dirty because diapers were never leaked. The covers sit on the mattress a little bit tight, it was so from the beginning. I believe to prevent folding under the baby