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 smarter, grow safer — the crib mattress that evolves with your little one!

SAFE SUSTAINABLE - No harmful flame retardants or synthetic chemicals—just pure, recyclable materials for peace of mind and planet care.
GROW WITH YOU DESIGN - Flip from firm infant support to a softer toddler side, extending mattress life and comfort as your child grows.
ACCIDENT PROOF COMFORT - Innovative waterproof, PVC-free quilted cover with zipper closure keeps the mattress pristine and sheets perfectly fitted.
BREATHE EASY SLEEP EASY - Certified to reduce 10,000+ chemical emissions, ensuring your baby’s environment is toxin-free and fresh.
PERFECT FIT ZERO HASSLE - Standard crib size with lightweight design means easy setup and seamless integration into any nursery.

The babylettoPure Core Crib Mattress is a Greenguard Gold Certified, dual-sided hybrid mattress featuring a quilted, waterproof, and removable cover. Designed for standard cribs, it offers firm support for infants and a softer side for toddlers, all while ensuring a chemical-free, safe sleeping environment with sustainable, non-toxic materials.

Specifications

Color	White
Product Dimensions	154.94 x 81.28 x 16 cm; 4.08 kg
Is Assembly Required	No
Primary material	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
Upholstery material	Cotton
Capacity	1 Count (Pack of 1)
Mattress Comfort	Standard
Top Finish	Tight Top
Care Instructions	Hand Wash Only
Number of Shelves	1
Shipping Weight	6.31 Kilograms
Item Model Number	M5321C
Department	unisex-baby
Manufacturer	Babyletto
Language	English
Item model number	M5321C
ASIN	B01EJC9BWM

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