Do you recommend buying an additional waterproof cover or will the one that comes with it be enough?

Aways have a spare one. You will need to line dry the cover that comes with it, but when kids are sick they can puke for several days (sometimes couple times a day)

What are the actual measurements of this mattress, (not just what the company claims)?

Hi- Our assembled Dimensions are 52.5" x 28.375" x 6". Thanks, Babyletto

I washed the mattress protector cover once in cold water on gentle and air dried it out. It now won’t fit or zip up over mattress! Anyone else?

Didn’t happen to me I washed immediately after purchase. I would contact babyletto!

Can I use a mattress protector on top of this?

You can but I don’t believe it is necessary as the cover included is removable and washable.

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Description

👶 Sleep Smart, Grow Green: The Mattress Every Millennial Parent Swears By

DUAL STAGE COMFORT - Firm infant side flips to softer toddler side for growing needs
CLEAN AIR CERTIFIED - Passes 10,000+ chemical emissions tests for a healthier nursery
ECO FRIENDLY SAFE - No harmful flame retardants, vinyl, or synthetic chemicals—pure peace of mind
ACCIDENT PROOF DESIGN - PVC-free waterproof backing keeps mattress pristine and dry
PERFECT FIT EFFORTLESS CARE - Standard crib size with zipper closure and seamless sheet fit

The Babyletto Pure Core Crib Mattress features a 2-stage dual-sided design with a firm infant side and softer toddler side, wrapped in a hybrid quilted waterproof cover that’s PVC-free and removable. GREENGUARD Gold certified, it ensures ultra-low chemical emissions for a healthier nursery environment. Made from 100% recyclable polyester with no harmful flame retardants or synthetic chemicals, it fits standard cribs perfectly and offers durable, easy-to-clean protection for your baby’s sleep and play.

Specifications

Product Dimensions	61 x 32 x 6.3 inches
Item model number	M5321C
Is Discontinued By Manufacturer	No
Safety warning	check instructions manual
Material Type	Cotton, Polyester
Material Composition	Outer layer: Cotton/Polyester; Batting: 80% Modacrylic Batting, 20% Polyester Fiber; Inner: Polyester; Cover: Face: Organic Cotton; Filling: Polyester; Backing: Food-grade polyethylene
Care instructions	refer to instructions
Additional product features	2-IN-1 REMOVABLE COVER: Multifunctional cover with a soft quilted cotton face and PVC-free backing to protect the mattress against accidents; Zipper closure and square corner design ensure a seamless sheet fit., GREENGUARD GOLD CERTIFIED: This mattress has undergone rigorous scientific testing for over 10,000 VOCs; It contributes to cleaner indoor air, creating a healthier environment for your baby to sleep, play, and grow., Material: Cotton and Polyester
Number Of Items	1
Style	unspecified
Batteries required	No
Item Weight	9 pounds
Age Range Description	Adult

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