A crib mattress is one of the few baby purchases your child will use every night for years, and one of the most important for safe sleep. The right one is firm, flat, and snug-fitting, and the best ones make cleanup and the toddler transition easier too.
We weighed firmness, safety certifications, breathability, ease of cleaning, and value to choose the best crib mattresses for every kind of family and budget. Here is what to know, plus our top picks.
Safety First
For infants, a crib mattress should be firm, not plush. A firm, flat surface lowers the risk of suffocation and SIDS. Skip soft toppers and always use a tight-fitting sheet with no gaps at the edges.
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How to choose a crib mattress
A few features matter more than the rest:
Firmness: Infant mattresses must be firm. Press the center and edges; it should spring back fast with no lasting indentation. Many models offer a firm infant side and a softer toddler side.
Fit: A standard crib mattress is about 27.25 by 51.625 inches. You should not be able to fit more than two fingers between the mattress and crib frame.
Foam vs. innerspring: Foam is lighter and often cheaper; innerspring tends to be more durable and supportive. Both can be excellent if firm.
Certifications: Look for GREENGUARD Gold or CertiPUR-US to limit chemical emissions, and waterproof or washable covers for the inevitable messes.
Dual-stage: A two-sided mattress that flips from infant-firm to toddler-soft saves you buying a second mattress later.
Our top crib mattress picks
Best Overall
The best crib mattress for breathability and easy washing
Made from a breathable, 3D-spun core that is fully washable, cover and all, under running water. It is firm for infants, flips to a more comfortable toddler side, and contains no foam, latex, or glue. The tradeoff is a higher price than basic foam models.
Certified organic with a waterproof, food-grade surface and no flame-retardant chemicals or polyurethane foam. It is firm and supportive with a wipeable cover, ideal if you want to minimize your baby’s chemical exposure. Premium price, but a popular long-term choice.
A trusted innerspring option with a firmer infant side and a softer toddler side, plus a waterproof, easy-clean cover. It hits a sweet spot of durability and price, though it is heavier than foam models when changing sheets.
A lightweight, GREENGUARD Gold-certified foam mattress at a fraction of the price of premium picks. It is firm and water-resistant, making it a smart choice for a second crib, a grandparent’s house, or a tight budget. Less plush and durable than higher-end models.
A hypoallergenic, medical-grade foam mattress with a firm infant side and plush toddler side, and a seamless, waterproof, wipeable cover. Very light to lift for 2 a.m. sheet swaps. A great middle-ground between budget foam and premium picks.
Yes, in some form. Many crib mattresses come with a waterproof or wipeable surface built in. If yours does not, add a fitted waterproof mattress protector under the sheet. Leaks, spit-up, and blowouts are constant in the early years, and a protected, washable surface keeps the mattress hygienic and lasting longer.
Frequently asked questions
How firm should a crib mattress be?
For infants, very firm. It should resist your hand and spring right back with no lasting dent. Soft mattresses increase suffocation risk, so firmness is a safety feature, not a comfort compromise.
Can a baby use the same mattress as a toddler?
Often yes. Many crib mattresses are dual-stage, with a firm infant side and a softer toddler side, and fit standard crib-to-toddler-bed conversions. That makes them usable for several years.
Is it safe to buy a used crib mattress?
Most experts recommend a new mattress for each baby when possible. A used mattress may have hidden wear, sagging, or moisture and bacteria in the core, which can affect both safety and hygiene.
