I was having such a hard time understanding what a mattress is and how to get a 'sheet' from photos and reviews so I decided to leave a review. The mattress is essentially a soft pillow that folds as shown in the attached image. As in the Q&A, I used a spare pad. I found a company on Amazon called BaeBae & Company that came with 3 interchangeable cases with cute arrows that matched perfectly. Also, I put a MBJERRY waterproof baby pad between the "mattress" and the sheet in case there are dirty nights. Overall I am happy with this bed. My son is not there yet but he seems to be as tall as some of the other cribs but I hope this crib lasts longer. I'm happy with the wheels too and they fit in and out of our room easily because who knows what the nights will be like! Hope this helps other confused buyers too!
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