We bought three of these mattress covers last year and they are wonderful. (We wash them quite often, so it's good to have a few.) They fit both 3-inch and 5-inch mattresses and add a nice layer of breathable, quilted fabric between the sheet and the mattress added. They won't shrink or lose their shape and are easy to pull over the mattress thanks to the wide elastic hem.
Gray Love To Dream Swaddle UP for Small Babies (8-13 lbs) - Improve Sleep Dramatically with Arms Up Position for Self-Soothing, Snug Fit Calming Startle Reflex
8 Review
Waterproof Fitted Crib and Toddler Mattress Pad Cover - American Baby Company (White, 52x28x9 Inch): Ultimate Protection for Boys and Girls (Pack of 1)
7 Review
🛏️ Graco Premium Foam Crib & Toddler Mattress – 2021 Edition: GREENGUARD Gold & CertiPUR-US Certified, Machine Washable, Breathable, Water-Resistant Cover, Ideal Firmness for Infants
9 Review
🛏️ Tri-fold Pack n Play Mattress Pad: Firm & Soft Sides for Babies and Toddlers, Portable Foldable Playard Mattress with Carry Case
6 Review
Pampers diapers New Baby Dry 2, 4-8 kg, 94 pcs., white
87 Review
Extra Large Baby Playard | Toddler Safety Activity Center With Anti-Slip Base & Tear-Resistant Material | 79”×70” Grey TODALE Playpen
39 Review
Large Toy Box Chest For Boys & Girls - 24.5"X13" X16", Flip-Top Lid, Divider, Collapsible Storage Bins For Nursery, Playroom, Closet & Living Room | Homyfort (Black)
39 Review
MaidMAX Cube Storage Bins, Foldable Fabric Storage Container With Handles For Closet, Laundry, Home And Office, Wood Grain Print, Set Of 6
41 Review