What is a standard size crib mattress?

What is a standard size crib mattress?


A standard size crib mattress is an essential component of a baby’s crib. It provides a comfortable and safe sleeping surface for infants. In this article, we will explore the dimensions, materials used, safety standards, and other important considerations related to standard size crib mattresses.


A standard size crib mattress typically measures 27 ¼ inches in width and 51 ⅝ inches in length. The thickness of the mattress can vary, but it is usually around 5-6 inches. These dimensions are designed to fit snugly into a standard size crib, ensuring that there are no gaps between the mattress and the crib’s sides.

It is important to note that there may be slight variations in dimensions among different manufacturers. Therefore, it is always recommended to measure the crib before purchasing a mattress to ensure a proper fit.

Materials Used

Standard size crib mattresses are typically made from a combination of materials that provide comfort and support for the baby. The core of the mattress is usually made from either foam or innerspring. Foam mattresses are lightweight and offer good support, while innerspring mattresses provide additional firmness.

The outer cover of the mattress is typically made from materials such as cotton, polyester, or a blend of both. These materials are breathable and help regulate the baby’s body temperature during sleep. Some mattresses also feature waterproof covers, which protect the mattress from spills and accidents.

Safety Standards

When it comes to crib mattresses, safety is of utmost importance. Standard size crib mattresses must meet certain safety standards to ensure the well-being of the baby. These standards include:

Firmness: A crib mattress should be firm to prevent the baby from sinking into it. This helps reduce the risk of suffocation or Sudden Infant Death Syndrome (SIDS).

Snug Fit: The mattress should fit snugly into the crib without any gaps. This prevents the baby from getting trapped between the mattress and the crib’s sides, reducing the risk of injury.

Flame Resistance: Crib mattresses are required to meet flammability standards to minimize the risk of fire hazards.

It is important to look for mattresses that comply with safety standards and have been tested and certified by reputable organizations, such as the Juvenile Products Manufacturers Association (JPMA) or the Consumer Product Safety Commission (CPSC).

Other Considerations

When choosing a standard size crib mattress, there are a few additional factors to consider:

Hypoallergenic: If your baby has allergies or sensitive skin, you may want to look for a mattress that is hypoallergenic and free from harmful chemicals.

Easy to Clean: Babies can be messy, so it is important to choose a mattress with a removable and washable cover for easy cleaning.

Longevity: Consider the durability of the mattress. It should be able to withstand regular use and last throughout the time your baby uses the crib.


A standard size crib mattress is an essential item for a baby’s crib. By understanding the dimensions, materials used, safety standards, and other considerations, you can make an informed decision when purchasing a crib mattress for your little one. Remember to prioritize safety, comfort, and durability to provide the best sleeping environment for your baby.


– www.jpma.org
– www.cpsc.gov