Quick Answer: An unsafe crib environment is one of the most significant risk factors for sudden infant death. A safe crib has a firm, flat, properly fitted mattress; no loose bedding, pillows, or bumper pads; and meets current Canadian Consumer Product Safety Act standards. Cribs made before 2009 should not be used -- they may not meet current safety requirements.
In This Guide
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The Crib Environment and Sudden Infant Death
The term "crib death" reflects an historical observation that sudden infant deaths typically occurred in the sleeping environment -- and the crib environment itself can be either a protective factor or a risk factor depending on how it is set up.
Research consistently shows that the physical sleep environment -- the surface, the space around the infant, the items in the crib, and the temperature of the room -- contributes significantly to sudden infant death risk. A poorly set-up crib introduces hazards that can be entirely prevented.
What the Data Shows About Sleep Environment and SIDS
A comprehensive case-control study by Tappin et al. (2002) and subsequent research from the New Zealand Cot Death Study found that soft sleep surfaces multiply SIDS risk by 5-20 times. Loose bedding such as quilts and duvets in the crib increase risk by 3-5 times. Bumper pads, once believed protective, have been implicated in suffocation deaths and are now banned in several jurisdictions. The American Academy of Pediatrics estimates that up to 55% of sleep-related infant deaths in the United States involve unsafe sleep environments, many of which are entirely preventable.
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What Makes a Crib Safe?
In Canada, all cribs, bassinets, and play yards sold for infant sleep must comply with the Canada Consumer Product Safety Act (CCPSA). This legislation sets minimum requirements for crib construction, materials, and hardware. But even a compliant new crib can become unsafe if set up incorrectly.
Structural Requirements
Canadian Crib Safety Standards (CCPSA)
- Slat spacing: Maximum 6 cm (2⅜ inches) between slats. A 355 mL soft drink can should not fit through -- if it does, the slat spacing is too wide.
- No drop-sides: Drop-side rail cribs have been banned in Canada since 2011. They were associated with structural failures causing infant entrapment. Do not use any crib with a drop-side mechanism regardless of its age or apparent condition.
- No cut-out decorative headboards: Decorative cut-outs can trap an infant's head or limbs.
- Corner posts: Corner post extensions above 1.5 mm are not permitted (they can catch clothing and cause strangulation).
- Solid hardware: No missing screws, loose bolts, or broken pieces. Check all hardware before each use.
- No modifications: Cribs should never be modified from their original design. Modified cribs do not meet the standards they were certified to.
When to Retire a Crib
Cribs manufactured before 2009 predate Canada's current safety regulations and should be retired. Even cribs that appear structurally sound may have slat spacing, hardware, or finish materials that do not comply with current standards. If you are unsure of the manufacture date, check the label on the underside of the crib frame or contact the manufacturer.
Second-hand cribs require careful evaluation. Crib frames can be assessed for compliance if you know the manufacturer and model -- but second-hand crib mattresses should never be used. A mattress that has been compressed, contaminated, or degraded by previous use is a risk.
The Mattress: A Safety Item, Not Just Comfort
The crib mattress is the most important component of the infant sleep environment from a safety perspective. It must be:
- Firm: Press the centre of the mattress firmly with both hands. It should spring back completely with no lasting depression. A mattress that holds an impression is too soft.
- Flat: No wedges, inclined bases, or foam cutouts. Despite claims about reflux or flat head prevention, inclined sleeping surfaces are not recommended by Health Canada and have been implicated in infant deaths.
- Properly fitted: No more than two finger-widths of gap between any edge of the mattress and the crib frame. Larger gaps create entrapment risk.
- New: Do not use a second-hand mattress. Biological degradation, mould, dust mites, and off-gassing from compromised foam all pose risks that cannot be adequately assessed from the outside.
Standard Crib Mattress Dimensions in Canada
A standard Canadian crib mattress measures 27¼ inches by 51⅝ inches (approximately 69 x 131 cm). This matches the internal dimensions of a standard-size crib. Mini cribs have smaller mattresses -- typically around 24" x 38". Always verify the mattress is designed for the specific crib model you are using.
At Mattress Miracle in Brantford, we carry properly sized, firm crib mattresses that meet Health Canada's requirements. Our team can help you identify what to look for and verify the mattress fits your crib correctly.
What to Remove From the Crib
The safest crib contains exactly two things: the mattress and a fitted sheet. Everything else is a potential hazard.
| Item | Risk | Alternative |
|---|---|---|
| Pillows | Suffocation, positional asphyxia | None needed |
| Quilts / comforters / duvets | Suffocation, overheating | Sleep sack / wearable blanket |
| Bumper pads | Suffocation; strangulation from ties; climbing hazard as infant grows | None needed; slat spacing already regulated |
| Stuffed animals and toys | Suffocation if infant's face presses against them | Remove at sleep time; safe outside the crib when awake |
| Sleep positioners / wedges | Positional asphyxia; entrapment | Not recommended by Health Canada |
| Loose fitted sheet (wrong size) | Sheet can come loose and wrap around infant's face | Use a fitted sheet sized specifically for your mattress |
What About Swaddling?
Swaddling -- wrapping the infant snugly in a light muslin blanket -- is appropriate for newborns and can support sleep quality in the early weeks. However, it must stop as soon as the infant shows signs of rolling (typically around 3-4 months). A swaddled infant who rolls to their stomach cannot reposition themselves, creating suffocation risk. Never swaddle past the rolling stage; transition to a sleep sack instead.
Choosing a Safe Crib in Canada
When purchasing a new crib, look for Canadian market certification. Cribs sold in Canada must meet CCPSA requirements, so any new crib purchased from a reputable Canadian retailer should comply. If purchasing online from an international retailer, verify the crib is certified to Canadian (not only US or European) standards.
What We See in Brantford
We are a mattress store in Brantford, not a crib retailer -- but over 37 years of helping families sleep better, we have had many conversations about crib mattresses and infant sleep safety. The most common issue we see is families using soft mattresses or putting extra padding on top of a firm mattress to make it "more comfortable." This is well-intentioned but creates real risk. A firm mattress is the correct choice -- the infant's comfort comes from warmth, familiarity, and secure attachment, not from a soft sleep surface.
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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.
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Call 519-770-0001Frequently Asked Questions
Are cribs dangerous for babies?
A properly set-up crib that meets Canadian safety standards is one of the safest places for an infant to sleep. The danger comes from improper setup -- soft mattresses, loose bedding, bumper pads, pillows, or outdated cribs that do not meet current standards. A safe, compliant crib with a firm, properly fitted mattress and nothing else is not dangerous.
Why are bumper pads not safe?
Bumper pads were designed to prevent infants from getting their heads stuck between crib slats -- a hazard that no longer exists because slat spacing is now regulated to a maximum 6 cm. Bumper pads have been implicated in infant suffocation deaths when infants' faces press against them, and in strangulation from their ties. Health Canada does not recommend bumper pads, and they are banned in several Canadian provinces.
Is it safe to use a second-hand crib mattress?
No. Second-hand crib mattresses should not be used. Used mattresses may harbour mould, bacteria, dust mites, and off-gassing from degraded foam that cannot be identified visually. Research from Scotland (Blair et al., 1999) found an association between second-hand mattresses and increased SIDS risk, though the mechanism is debated. Health Canada recommends using a new crib mattress for each baby.
What should I look for in a crib mattress?
Look for a firm mattress that does not hold an impression when you press it firmly with both hands. It should fit your crib snugly with no more than two finger-widths of gap on any side. It should be flat -- not inclined or contoured. Standard Canadian crib mattress dimensions are 27¼ inches by 51⅝ inches. At Mattress Miracle in Brantford, we can help you choose a crib mattress that meets these requirements.
My crib is 10 years old. Is it safe to use?
Possibly not. Cribs manufactured before 2009 predate Canada's current safety regulations under the CCPSA. Even if the crib looks structurally sound, it may not meet current standards for slat spacing, hardware, finish materials, or corner post height. Additionally, hardware and joints can loosen or fatigue over time. If you cannot verify the manufacture date and confirm current compliance, purchasing a new crib is the safer choice.
Sources
- Moon, R.Y., & Task Force on SIDS. (2016). SIDS and other sleep-related infant deaths: Updated 2016 recommendations for a safe infant sleeping environment. Pediatrics, 138(5), e20162938. doi.org/10.1542/peds.2016-2938
- Health Canada. (2021). Safe sleep for your baby. Public Health Agency of Canada. canada.ca/en/public-health/services/infant-care/safe-sleep.html
- Canadian Paediatric Society. (2019). Safe sleep environments for infants. Paediatrics & Child Health, 24(1), 66. doi.org/10.1093/pch/pxy166
- Blair, P.S., Fleming, P.J., Bensley, D., et al. (1999). Bedsharing, sleeping position and sudden infant death syndrome. BMJ, 319(7223), 1457-1462. doi.org/10.1136/bmj.319.7223.1457
- Tappin, D., Brooke, H., Ecob, R., & Gibson, A. (2002). Used infant mattresses and sudden infant death syndrome in Scotland: Case-control study. BMJ, 325(7371), 1007. doi.org/10.1136/bmj.325.7371.1007
- Filiano, J.J., & Kinney, H.C. (1994). A perspective on neuropathologic findings in victims of the sudden infant death syndrome: The triple-risk model. Biology of the Neonate, 65(3-4), 194-197. doi.org/10.1159/000244052
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Related Reading
- Crib Death (SIDS): Causes, Risk Factors, and Prevention
- Crib Bed Size: Standard Dimensions and Safety Guide
- How Big Is a Crib Mattress?
- Infant Pacifier: Safety, Benefits, and When to Wean
- Is It Safe to Sleep with a Space Heater On?
Visit Our Brantford Showroom
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Mattress Miracle -- 441½ West Street, Brantford, ON -- (519) 770-0001
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If you need a safe, firm, properly sized crib mattress for a new baby, come by the showroom and we will help you find the right one.