Waterproof Crib Mattress — Hiccapop Dual Sided Infant & Toddler

Description

A waterproof crib mattress earns its keep the first time a diaper fails overnight — but the cover is only half of what matters here. This one is dual sided: an extra-firm side built for infant safety, and a plush memory foam side for once your child has moved into a toddler bed. It's 6 inches thick, fits any standard crib at 52" x 27.5", and has rounded corners with reinforced edge support so there's no gap along the crib frame — the kind of gap that swallows pacifiers and, more importantly, that safe sleep guidance tells you to eliminate entirely.

The infant side is where you start, and it's the side that matters most clinically. The American Academy of Pediatrics recommends a firm, flat sleep surface for infants — one that doesn't leave an indentation when your baby lies on it. The soft memory foam side of any two-stage mattress is not for infants, and Hiccapop is clear about that. Most pediatric guidance puts the flip somewhere after the first birthday, and practically speaking, you flip when your child transitions out of the crib and into a toddler bed. If you're unsure where your child falls, ask your pediatrician before you turn it over.

What sets this waterproof crib mattress apart in a crowded category is how the cover is built and what's underneath it. The outer jacquard cover resists liquids and stains, zips off completely, and goes in the washing machine — which stops mattering in theory and starts mattering somewhere around 3 a.m. The inner cotton cover is fiberglass-free, which is worth checking on any crib mattress you're considering; fiberglass is used as a flame barrier in some foam mattresses and can escape if the cover is removed. Hiccapop states the foam is CertiPUR-US certified and the mattress is made in the USA, and it carries their lifetime satisfaction guarantee on purchases made through Amazon or hiccapop directly.

I recommend a waterproof crib mattress like this one for the same reason I recommend buying a good car seat: it's a piece of equipment your child uses unsupervised, for thousands of hours, during the years when you can't ask them how it's going. Buying it once, from a manufacturer willing to publish what's inside it, is a reasonable place to spend money.

Why women love it

• Waterproof, machine-washable cover: unzips completely and goes in the wash — no scrubbing a soaked mattress by hand
• Two stages, one purchase: firm infant side and plush toddler side — you're not buying a second mattress at 18 months
• Genuinely firm infant side: meets the "firm and flat" standard pediatric safe sleep guidance calls for, with no indentation under a newborn
• Fiberglass-free inner cover: no fiberglass flame barrier to worry about if the outer cover comes off
• CertiPUR-US certified foam: independently certified for foam content and durability, per Hiccapop
• Snug universal fit: 52" x 27.5" with rounded corners and edge support, so there's no gap along the crib rails
• Made in the USA with a lifetime satisfaction guarantee: covers manufacturing defects and accidental damage on Amazon and direct purchases

Best for

• Households dealing with frequent leaks, reflux, or nighttime accidents — the washable cover is the selling point
• Parents setting up a first nursery who want to buy the mattress once and be done
• Anyone prioritizing a firm infant sleep surface that meets current safe sleep guidance
• Families planning to convert the crib into a toddler bed later
• Parents specifically screening for fiberglass-free and CertiPUR-US certified foam
• A substantial, genuinely useful baby shower gift for someone who's registered for a crib but not a mattress

A safe sleep surface is only one piece of getting a newborn to sleep — and getting you some sleep. Mindy's guide to newborn sleep tips and tools covers what actually helps in those first months, and if you're still building out the nursery, her newborn essentials checklist sorts what you truly need from what you can skip.

Our baby care essentials collection has the rest of what Mindy recommends for the nursery and the first year, from sleep to feeding to daily care. For more on this stage, her postpartum and baby care articles cover newborn care and recovery from a nurse practitioner's perspective.

FAQs

What is a dual sided crib mattress? 

A dual sided crib mattress has two different sleep surfaces — an extra-firm side designed for infants and a softer side designed for toddlers. You use the firm side from birth, then flip the mattress over once your child transitions to a toddler bed. It lets one mattress cover both stages instead of buying two.

Which side of the crib mattress do I use for a newborn? 

Always the firm side. The American Academy of Pediatrics recommends a firm, flat sleep surface for infants — one that shows no indentation when your baby lies on it. The soft memory foam side is not appropriate for infant sleep, because a surface that conforms to a baby's face increases suffocation risk if they roll onto their stomach.

When should I flip the crib mattress to the toddler side?

Most guidance puts it after the first birthday at the earliest, and in practice you flip when your child moves out of the crib into a toddler bed. Developmental readiness matters more than a birthday — climbing the crib rails is the usual signal. Ask your pediatrician if you're unsure about timing.

Is a memory foam crib mattress safe for babies? 

A memory foam surface is not recommended for infant sleep. Memory foam conforms to the body, which can create a pocket around a baby's face and raise the risk of rebreathing or suffocation. That's why this mattress is dual sided — you use the firm infant side first, and the memory foam side waits until your child is older.

Is a waterproof crib mattress cover the same as a mattress protector? 

No. A waterproof crib mattress has the barrier built into its own cover, so liquid never reaches the foam. A mattress protector is a separate layer you buy and add on top. This mattress has the waterproof layer built in, though many parents still add a protector to cut down on washing the main cover.

Does this waterproof crib mattress fit a standard crib?

Yes. It measures 52" x 27.5" x 6", which is the standard full-size crib mattress dimension in the US. Rounded corners and reinforced edge support create a snug fit against the crib frame. You should not be able to fit more than two fingers between the mattress and the crib sides.

Is the crib mattress cover machine washable?

Yes. The outer jacquard cover is waterproof to resist liquids and stains, and it unzips completely so you can machine wash and dry it. The inner cotton cover is fiberglass-free. Keeping a spare fitted sheet on hand makes the wash cycle a lot less stressful at 3 a.m.

Is this crib mattress non-toxic? 

Hiccapop states the foam is CertiPUR-US certified, meaning it's been tested for content, emissions, and durability, and that the mattress is BPA-free and fiberglass-free. It's made in the USA and Hiccapop reports it exceeds US safety standards. As with any crib mattress, air it out in a ventilated room before first use.