A crib mattress is where your baby spends more time than anywhere else — up to 16 hours a day in the early months. Despite that, mattress selection often gets less attention than the crib itself. Here's what actually matters when choosing one.
Firmness Is Non-Negotiable
A safe crib mattress must be firm. The simple test: press your hand into the centre — it should spring back immediately with no indentation. Soft mattresses that conform to a baby's face pose a suffocation risk. This is one area where personal comfort preferences don't apply; infant sleep surfaces follow safety guidelines, not adult sleep science.
Fit Matters as Much as Firmness
The mattress should fit snugly inside the crib with no gaps wider than two fingers between the mattress edge and the crib wall. A gap creates an entrapment risk. Standard cribs use standard mattress sizes, but always verify — especially with imported or custom cribs popular among Canadian families.
Material Options
- Innerspring: Traditional, firm, good airflow. Heavier, which makes sheet changes more physical.
- Foam: Lighter weight, easier to manage during late-night sheet changes. Look for high-density foam (minimum 1.5 lb/ft³) for adequate firmness.
- Organic: Cotton, wool, or natural latex cores. Appeals to families seeking reduced chemical exposure. Typically higher priced.
- Dual-firmness: Infant-firm on one side, toddler-comfortable on the other. Extends the mattress through the crib-to-toddler-bed transition.
Retailer Insight
Our team evaluates mattress firmness, cover quality, and weight on every model we carry. The detail most parents overlook is the waterproof cover — an integrated waterproof layer saves you from buying a separate mattress protector and simplifies cleanup after nighttime accidents. For nursery planning that includes the mattress and more, explore our full baby furniture selection.
Frequently Asked Questions
Do I need a separate mattress protector?
If your crib mattress has a built-in waterproof cover, a separate protector is optional. If it does not, a waterproof fitted protector is strongly recommended — it extends mattress life and simplifies cleanup after nighttime accidents.
How firm should a crib mattress be?
A safe crib mattress should not conform to your baby face shape when pressed. Press the centre firmly — it should spring back immediately with no lasting indentation. This firmness level feels uncomfortable to adults but is the safety standard for infant sleep surfaces.
