I ordered a custom mattress for an old antique white iron isolette from a hospital nursery for my Himalayan cats. It fits perfectly! I also ordered a fitted cradle sheet and a little blue and white silky blanket and I have to tell you it looks completely adorable. The entire ensemble is now together and all 3 of my cats are in and out of the little crib. There are times when all 3 of them are sleeping in there. Thanks so much for making customs items! If it weren’t for ababy.com I would be left with an old crib with no mattress or bedding!