Standard Crib Mattress Size
When it comes to preparing for a new baby, one of the most important items to consider is the crib mattress. After all, your little one will spend a lot of time sleeping and playing on it. But with so many options available, it can be overwhelming to determine the right size for your crib. In this article, we will break down the top 10 typical crib mattress dimensions to help you make the best choice for your baby's nursery.
Dimensions of a Crib Mattress
Before we dive into the specific dimensions, it's important to understand what the standard size for a crib mattress is. A crib mattress should measure 27 inches by 52 inches, with a thickness of 6 inches. This is the size that will fit most standard cribs perfectly. However, there are a few other sizes that may be labeled as "crib mattresses" but differ from this standard size. Let's take a closer look at those now.
What is the Standard Size of a Crib Mattress
The standard size of a crib mattress, as mentioned above, is 27 inches by 52 inches. This size is recommended by the Consumer Product Safety Commission (CPSC) to ensure the safety of infants. It is also the most common size, making it easier to find sheets and other bedding accessories that will fit properly.
Standard Crib Mattress Measurements
As we mentioned before, there are some crib mattresses that may have slightly different measurements than the standard size. Here are a few examples:
Mini crib mattress: This size is typically around 24 inches by 38 inches, making it smaller than the standard size. It is a good option for smaller spaces or as a sidecar crib attached to the parents' bed.
Portable crib mattress: This size is usually around 24 inches by 38 inches as well. It is designed to fit pack n' play cribs and is a great option for travel.
Toddler mattress: Some cribs convert into toddler beds, and therefore require a slightly larger mattress. These mattresses usually measure 28 inches by 52 inches.
Typical Crib Mattress Dimensions
Aside from the standard size and the alternative sizes mentioned above, there are also some "non-standard" dimensions that may be labeled as crib mattresses. These include:
Crib/toddler mattress: This size is usually around 27 inches by 52 inches, but with a thickness of 5 inches. It is a good option for cribs that convert into toddler beds.
Crib/junior mattress: This size is typically around 27 inches by 52 inches, but with a thickness of 6 inches. It is designed for cribs that convert into junior beds.
Crib/full mattress: This size is usually around 27 inches by 52 inches, but with a thickness of 8 inches. It is designed for cribs that convert into full-size beds.
Standard Crib Mattress Size Chart
To make it easier to compare the different dimensions, here is a chart that breaks down the sizes we've discussed so far:
Average Crib Mattress Size
With so many different sizes available, you may be wondering what the average crib mattress size is. As we've discussed, the standard size is 27 inches by 52 inches, and this is also the most common size. However, the "average" size may vary depending on the type of crib and mattress you choose.
Standard Crib Mattress Size in Inches
To reiterate, the standard crib mattress size is 27 inches by 52 inches. This size is equivalent to 68.58 centimeters by 132.08 centimeters. Keep in mind that the thickness of the mattress may vary.
Standard Crib Mattress Size in Feet
The standard crib mattress size is also equivalent to 2.25 feet by 4.33 feet. This size is important to keep in mind when measuring the space in your baby's nursery and ensuring that the crib will fit comfortably.
Standard Crib Mattress Size in Centimeters
As mentioned earlier, the standard crib mattress size is equivalent to 68.58 centimeters by 132.08 centimeters. This size is recommended by the CPSC for the safety and comfort of your baby.
When it comes to choosing a crib mattress, it's important to consider the size and dimensions to ensure the safety and comfort of your little one. Remember to measure the space in your nursery and check the dimensions of the crib before making a purchase. With this guide, you can confidently choose the perfect crib mattress for your baby's nursery.
The Importance of Choosing the Right Crib Size Mattress for Your Baby's Safety and Comfort

Why the Size of a Crib Mattress Matters?
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The Standard Dimensions of a Crib Size Mattress

Why You Should Stick to Standard Dimensions

Other Factors to Consider When Choosing a Crib Size Mattress
