Hi All! I'm a FTM due April 28, just freaking out trying to make sure I have everything ready! We bought this playard: https://www.babytrend.com/nursery_centers_deluxe/PY47777.html , which I really liked because it has a removable bassinet that lies flat. The problem is, the company that makes it warns not to use any fitted sheets, etc, other than the provided mattress (which is ridiculous, because the care instructions state that the included mattress cover is not washable). It's a non-standard size (smaller than most bassinets), so the sheets and mattress covers designed for bassinets aren't an option. I was thinking I could just put down a changing pad liner and cover that with a pillowcase, which I've read as a suggestion for a makeshift fitted bassinet sheet. However, the tag on the Boppy changing pad liners that I bought also have the word "sleep" with a big scary line through them, so now it seems like that's not safe, either.
TL;DR: What kind of bedding can I use on a non-standard size bassinet without putting my baby in danger or having to throw the bassinet away the first time she leaks through her diaper? Thanks for your help!