How To Choose The Right Crib Mattress Size
Crib mattress sizes vary by the type of crib you'll be using, so parents should pay close attention.
In addition to size, the firmness of the mattress matters, too. Though you might think your baby would be more comfortable on a soft, plush mattress, a firm mattress is the safest option for babies. Babies sleep a lot, so you want to make the right mattress choice. Learn more about what crib mattress size you should be using and how you can make sure to pick the right one for your baby.
According to the Consumer Product Safety Commission (CPSC), all full-size crib mattresses should measure at least 27 ¼ by 51 ⅝ inches and be no more than six inches thick. This helps ensure the mattress fits snugly within a standard-sized crib, which has interior measurements of 28 by 52 ⅜. These standardizations make it safe to mix and match full-size cribs and mattresses.
Unlike full-size crib mattresses, the dimensions of mini crib, travel crib and bassinet mattresses can vary. On average, mini crib mattresses are 24 by 38 inches. Travel crib and bassinet mattresses vary more widely in size—and even shape. Because the sizes of these types of cribs and mattresses are not standardized, the CPSC states that the correctly-sized mattress should always come with the crib. It's crucial that caregivers only use the mattress that comes included with the mini crib, travel crib or bassinet.
Using the correct mattress size is a must for your baby's health. 'A mattress that doesn't fit snugly inside the crib can create serious safety risks for your little one. If there's even a small gap between the mattress and the crib frame (more than two fingers wide) your baby could accidentally get an arm, leg or even their head trapped,' says Dr. Karp.
If the mattress is too big, it won't fit in the crib properly, which would create an uneven sleep surface. When it comes to the height of the mattress, you want it to stay under 6 inches to prevent older babies from climbing out and falling.
Choosing the right mattress size is easy once you know what type of crib you'll be using.
Standard-sized cribs sold in the US are compatible with standard-sized mattresses sold in the US. Although these regulations allow you to mix and match cribs and crib mattresses, it's still a good idea to get measurements for your mattress and the interior of your crib before purchasing to make sure they are a good fit. The manual for your crib should also list the ideal mattress size for the best fit. When it comes to travel cribs, mini cribs and bassinets, always use the mattress that comes with the product, as sizes differ greatly by brand.
In addition to fitting cribs, crib mattresses are also compatible with standard-sized toddler beds sold in the US. Many mattresses even have a slightly less firm side to flip to when you're ready to make the transition to a toddler bed.
If you're looking to purchase a crib and a crib mattress for your baby, check out our guides to the best crib mattresses and the best cribs.
Keeping your baby safe while they're sleeping is about more than just their mattress. According to the American Academy of Pediatrics (AAP), babies should always be placed on their backs in an empty crib (no bumpers, blankets, pillows or stuffed animals). Karp offers additional safe sleep recommendations, including room sharing (not bed sharing) with your baby, using a pacifier and keeping the room between 68 and 72 degrees Fahrenheit. 'Following safe sleep guidelines is one of the most important things you can do to reduce your baby's risk of the sleep-related deaths, which tragically claim the lives of about 3,700 babies a year,' he says.
Yes, a standard crib mattress can fit in a toddler bed. This includes cribs that can transition to toddler beds as well as standalone toddler beds.
Av standard crib mattress is 27 ¼ by 51 ⅝ inches and should be no more than six inches thick. This ensures the mattress will fit snugly in a standard crib and create a safe sleep space for your baby.
No, a twin mattress is larger than a crib mattress. Standard twin mattresses are 38 x 75 inches, while standard crib mattresses are 27 ¼ by 51 ⅝ inches.
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