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Health Canada Safe Sleep Rules
The Canadian Paediatric Society and Health Canada are clear: babies must sleep on a firm, flat surface. This means:
- Firm mattress: When you press your hand on the centre and edge, the surface should spring back immediately. It should not conform to your hand shape. What feels uncomfortably firm to an adult is correct for a baby
- Snug fit: No more than two finger-widths gap between the mattress edge and the crib frame on any side. Gaps create entrapment hazards
- Flat surface: No inclines, wedges, or contoured surfaces. Babies must sleep flat on their backs. Inclined sleepers have been recalled due to suffocation deaths
- Nothing else in the crib: No pillows, blankets, stuffed animals, bumper pads, or sleep positioners. A fitted sheet over the mattress is the only addition. Use a sleep sack for warmth instead of blankets
- On their back: Always place babies on their back to sleep, for every sleep, until they can consistently roll both ways on their own
Why Firm Matters for Babies
Babies lack the motor skills and strength to reposition themselves if their face becomes pressed into a soft surface. A firm mattress keeps the airway clear even if the baby turns their head. Soft mattresses, memory foam, and pillow tops create suffocation risk because the surface conforms to the face rather than supporting it. What feels comfortable to an adult is dangerous for an infant. A baby's comfort on a firm mattress is different from an adult's. They do not need cushioning because they weigh so little that pressure points are not a concern.
How to Choose a Crib Mattress
Key Selection Criteria
Size: Standard Canadian crib mattress: 27.25 x 51.625 inches (69.2 x 131.1 cm), 6 inches thick or less. Measure your crib frame interior to confirm. Some cribs use non-standard sizes.
Firmness test: Press the centre and corners firmly. It should resist your hand and spring back. If it holds your hand impression, it is too soft.
Weight: Consider that you will be changing sheets (often at 3 AM). A lightweight mattress is easier to handle. Foam mattresses are lighter than innerspring.
Waterproof: Babies produce a remarkable amount of fluid. A waterproof mattress or waterproof cover is essential. Built-in waterproofing is most convenient.
Certifications: Look for CertiPUR-US (foam safety), GREENGUARD Gold (low emissions), or similar certifications
. Babies spend 12-17 hours per day on this surface. Material safety matters.
Dual-sided (optional): Some crib mattresses have an infant-firm side and a toddler-slightly-softer side. Extends the mattress lifespan through toddler years.
Crib Mattress Materials
- Foam (most common): Lightweight, affordable, firm when high-density. Ensure density is at least 1.5 lbs per cubic foot for adequate firmness. CertiPUR-US certified for low emissions. $80-200
- Innerspring: Traditional coil mattresses. Heavier but durable. 135+ coil count is standard. Good airflow. $100-250
- Organic foam/latex: Natural materials, fewer chemicals. GOTS or GOLS certified. More expensive but lowest chemical exposure. $200-400. Worth considering given the hours babies spend on the surface
- Coconut coir/natural fiber: Natural, firm, breathable. Often combined with organic latex or wool. Premium price but excellent for chemical-sensitive families
Care and Maintenance
Keeping the Crib Mattress Clean and Safe
(1) Waterproof cover: Use a fitted, breathable waterproof cover under the fitted sheet. This protects against diaper leaks, spit-up, and drool. (2) Wash cover regularly: At least weekly, or immediately after any fluid exposure. Hot wat
er wash. (3) Check firmness: Over time, foam mattresses can soften. Check firmness every few months with the hand press test. Replace if it no longer springs back. (4) Never use a used crib mattress: You do not know its history, how it was stored, or whether internal structure has degraded. SIDS risk increases with used mattresses. Always buy new. (5) When to transition: Move to a toddler bed or regular bed when your child can climb out of the crib (usually 18-36 months) or reaches 35 inches tall.
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
Can I use a memory foam crib mattress?
No. Memory foam conforms to shape, creating a suffocation risk for babies who cannot reposition themselves. Health Canada and the Canadian Paediatric Society recommend firm, non-conforming surfaces only. Memory foam crib mattresses should not be used for infants.
Can I use a used crib mattress?
It is strongly discouraged. Used mattresses may have degraded firmness, hidden mould from fluid exposure, and unknown contaminants. Research shows an association between used mattresses and increased SIDS risk. A new crib mattress is $80-200 and worth the investment for safety.
When does my baby need a pillow?
Not until at least 18-24 months, and even then it is optional. Many toddlers sleep fine without a pillow until age 3-4. When you do introduce a pillow, choose a small, thin, firm toddler pillow. Adult pillows are too large and soft for young children.
My baby seems uncomfortable on a firm mattress. Should I add padding?
Never add padding, mattress toppers, or soft layers to a crib mattress. Babies are not uncomfortable on firm surfaces the way adults would be. They weigh so little that pressure points are not an issue. The firm surface keeps them safe. Use a sleep sack for warmth and comfort instead.
Sources
- Jacobson BH, Boolani A, Smith DB. Changes in back pain, sleep quality, and perceived stress after introduction of new bedding systems. J Chiropr Med. 2009;8(1):1-8. DOI: 10.1016/j.jcm.2008.09.002
- Radwan A, Fess P, James D, et al. Effect of different mattress designs on promoting sleep quality, pain reduction, and spinal alignment in adults with or without back pain. Sleep Health. 2015;1(4):257-267. DOI: 10.1016/j.sleh.2015.08.001
- Kovacs FM, Abraira V, Peña A, et al. Effect of firmness of mattress on chronic non-specific low-back pain: randomised, double-blind, controlled, multicentre trial. Lancet. 2003;362(9396):1599-1604. DOI: 10.1016/S0140-6736(03)14792-7
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Hours: Monday–Wednesday 10am–6pm, Thursday–Friday 10am–7pm, Saturday 10am–5pm, Sunday 12pm–4pm.