Quick Answer: A waterproof crib mattress has a built-in moisture barrier that prevents liquids from reaching the foam or spring core. Most quality crib mattresses sold in Canada ($100+) include waterproof covers. Budget models may be water-resistant rather than fully waterproof. Adding a separate waterproof protector on top provides double protection and is easier to wash than the mattress cover.
In This Guide
Reading Time: 8 minutes
Built-In vs. Separate Waterproofing
Crib mattresses handle waterproofing in one of two ways: a built-in waterproof cover that is part of the mattress construction, or a removable cover that you can take off and wash. Both approaches work, but they have different practical implications.
| Feature | Built-In Waterproof Cover | Separate Waterproof Protector |
|---|---|---|
| Protection level | Full coverage, factory-sealed seams | Full coverage, elastic edges |
| Washability | Wipe clean only | Machine washable |
| Replacement | Replace entire mattress if damaged | Replace protector only ($15-35) |
| Breathability | Varies by manufacturer | Generally good (TPU) |
| Cost | Included in mattress price | $15-40 additional |
The best approach is both: choose a crib mattress with a built-in waterproof cover and add a separate waterproof protector on top. The built-in cover acts as a last line of defence, while the protector handles day-to-day moisture and can be tossed in the washing machine weekly.
Waterproof Materials Explained
The waterproof barrier in a crib mattress is a thin membrane that blocks liquid while (ideally) allowing air to pass through. Not all waterproof materials are created equal.
Food-Grade Polyethylene
This is the most common waterproof material in quality crib mattresses. It is the same food-safe plastic used in food packaging, making it one of the lowest-toxicity options available. It creates a complete moisture barrier, is naturally hypoallergenic, and does not contain BPA, phthalates, or lead.
Vinyl (PVC)
Found in cheaper crib mattresses, vinyl provides effective waterproofing but has significant drawbacks. It is not breathable, which can cause the mattress surface to feel hot and sweaty. More importantly, vinyl can contain phthalates, which are endocrine-disrupting chemicals. Health Canada has restricted phthalates in children's products, but some imported mattresses may not comply.
TPU (Thermoplastic Polyurethane)
Used more commonly in separate protectors than built-in covers, TPU offers the best balance of waterproofing, breathability, and chemical safety. It is free from PVC, phthalates, and heavy metals.
Chemical Safety in the Nursery
Infants spend 14 to 17 hours per day on their crib mattress, breathing air just inches from the surface. Research on indoor air quality in nurseries highlights the importance of choosing low-emission materials for the sleep surface. CertiPUR-US and GREENGUARD Gold certifications test for volatile organic compounds (VOCs) that could affect indoor air quality, making these certifications particularly valuable for crib products.
8 min read
What to Look For
Waterproof Crib Mattress Checklist
- Fully waterproof: Not just "water-resistant" or "moisture-wicking"
- Sealed seams: Moisture should not leak through stitching
- Wipeable surface: Should clean easily with mild soap and water
- No vinyl/PVC: Choose food-grade polyethylene or TPU
- Breathable: Allows airflow to prevent heat buildup
- Certified: CertiPUR-US (foam) or GREENGUARD Gold
- Firm: Waterproofing should not compromise firmness
Brad, Owner, 40+ years of experience: "Parents ask me: is the waterproof cover on my crib mattress enough? I tell them it is your safety net, not your first line of defence. Add a separate protector on top. When the protector gets soiled, you wash it. The mattress cover stays clean underneath. Two layers, no worries."
Maintaining Your Waterproof Mattress
Regular Cleaning
Wipe the waterproof mattress surface with a damp cloth and mild soap weekly, or after any visible soiling. Allow the surface to air dry completely before replacing the sheet. Never submerge a crib mattress in water or run it through a washing machine.
Air It Out
Stand the mattress upright periodically to allow airflow on all surfaces. This helps prevent moisture accumulation between the mattress bottom and the crib platform, which can occur in humid conditions.
Inspect Regularly
Check the waterproof cover for tears, cracks, or degradation every few months. A compromised waterproof layer allows moisture to reach the mattress core, where it can cause mould growth that you cannot see from the outside.
Top Features to Prioritize
Dual-Sided Design
Some waterproof crib mattresses feature different firmness levels on each side: a very firm infant side and a slightly less firm toddler side. Both sides maintain waterproofing. This design extends the mattress's useful life from birth through age 3 or 4.
Removable Washable Cover
A waterproof cover that zips off for machine washing is more convenient than a cover that can only be wiped down. However, the inner foam or spring core must also have its own waterproof barrier, not just the removable cover.
GREENGUARD Gold Certification
This certification tests the complete mattress (not just individual materials) for chemical emissions under conditions that simulate a child's room. It is the most relevant certification for a product that sits in an enclosed nursery where your baby sleeps for most of the day.
Crib Mattress Shopping in Brantford
Mattress Miracle on West Street carries waterproof crib mattresses and mattress protectors you can inspect in person. The team can show you the difference between built-in waterproofing, separate protectors, and help you set up the ideal layering system for your nursery.
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Find Your Perfect Mattress at Mattress Miracle
We are a family-owned mattress store in Brantford, helping our community sleep better since 1997. Come try mattresses in person and get honest, no-pressure advice.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
Are all crib mattresses waterproof?
No. Budget crib mattresses (under $80) may be only water-resistant, meaning they slow moisture but do not block it completely. Quality crib mattresses ($100+) typically include a fully waterproof cover, but always verify by checking the product specifications.
Do I still need a protector if my crib mattress is waterproof?
Yes. A separate waterproof protector is easier to wash than the mattress cover and provides an additional barrier. If the built-in waterproof cover is ever damaged, the protector keeps the mattress core dry.
How do I know if the waterproof cover is damaged?
Look for cracks, tears, or discolouration on the mattress surface. If you notice any moisture reaching the mattress core after a spill, the waterproof barrier has been compromised and the mattress should be replaced.
Can a waterproof crib mattress cause overheating?
Cheap vinyl-covered mattresses can trap heat. Quality waterproof mattresses use breathable materials like food-grade polyethylene that allow airflow while blocking liquids. If your baby seems hot, check that your mattress uses breathable waterproofing rather than solid vinyl.
Where can I find waterproof crib mattresses in Brantford?
Mattress Miracle at 441 1/2 West Street in Brantford carries waterproof crib mattresses and protectors. The team can help you evaluate waterproofing quality and choose the right option for your nursery.
Sources
- Health Canada. (2016). Cribs, Cradles and Bassinets Regulations (SOR/2016-152).
- Moon, R.Y., et al. (2022). Sleep-Related Infant Deaths. Pediatrics, 150(1), e2022057990.
- Canadian Paediatric Society. (2024). Safe sleep for babies. Caring for Kids.
- Colvin, J.D., et al. (2014). Sleep environment risks. Pediatrics, 134(2), e406-e412.
- Health Canada. (2021). Phthalates regulations for children's products. Canada Consumer Product Safety Act.
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle , 441½ West Street, Brantford, ON · (519) 770-0001
Hours: Monday–Wednesday 10am–6pm, Thursday–Friday 10am–7pm, Saturday 10am–5pm, Sunday 12pm–4pm.