Soft microfibre cut to the standard 52 by 28 inch crib mattress with elastic all the way round, so it can't work loose in the night. Two of them is the minimum that survives one bad night.
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The standard crib mattress in almost every nursery
Buy at least four sheets in total — two is one on the mattress and one in the wash, with no margin.
Also worth your money — where we'd turn if the top pick is sold out or over budget.
A cotton terry surface over a waterproof backing that doesn't crackle when they roll on it — the reason cheap protectors get thrown out. Stretch pockets keep it flat instead of rucking into a lump.
100+ bought in past month on Amazon
Zips right around the mattress rather than sitting on top, so a leak can't get in at the sides — and it blocks dust mites while it's there.
Cut to the 39 by 27 inch playard mattress that standard crib protectors don't fit, with a quilted bamboo-viscose top that's soft enough to nap on directly.
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