How long is a crib mattress?

How long is a crib mattress?


When it comes to setting up a nursery for a new baby, one of the essential items to consider is the crib mattress. A crib mattress is designed to provide a safe and comfortable sleeping surface for infants. However, many parents may wonder about the standard size of a crib mattress. In this article, we will dive deeper into the topic and explore the dimensions of a crib mattress.

Standard Crib Mattress Size

Dimensions: The standard size of a crib mattress is 28 inches in width and 52 inches in length. This size ensures a snug fit within a standard-sized crib. The thickness of a crib mattress can vary, but it typically ranges from 4 to 6 inches.

Regulations: The dimensions of a crib mattress are regulated by the Consumer Product Safety Commission (CPSC) in the United States. These regulations ensure that crib mattresses meet safety standards and fit securely within standard-sized cribs.

Types of Crib Mattresses

Innerspring Mattresses: Innerspring crib mattresses are constructed with steel coils surrounded by layers of padding and foam. These mattresses provide firm support and durability. The number of coils and the gauge of the steel used can vary, affecting the overall firmness and quality of the mattress.

Foam Mattresses: Foam crib mattresses are made from polyurethane foam and offer a lightweight and affordable option. They provide a comfortable sleeping surface for infants. The density and thickness of the foam can vary, impacting the level of support and firmness.

Organic and Natural Mattresses: Organic and natural crib mattresses are made from materials such as organic cotton, wool, or natural latex. These mattresses are free from chemicals and synthetic materials, making them a popular choice for parents seeking an eco-friendly and non-toxic option.

Additional Considerations

Firmness: It is important to choose a crib mattress that is firm. The American Academy of Pediatrics (AAP) recommends a firm mattress to reduce the risk of Sudden Infant Death Syndrome (SIDS) and suffocation hazards.

Waterproofing: Some crib mattresses come with a waterproof cover or have a waterproof layer. This feature helps protect the mattress from spills, accidents, and stains, making it easier to clean and maintain.

Convertible Cribs: If you plan to use a convertible crib that can be transformed into a toddler bed or a daybed, it is essential to ensure that the crib mattress fits the different configurations of the crib.


In summary, a standard crib mattress measures 28 inches in width and 52 inches in length, with a thickness ranging from 4 to 6 inches. These dimensions are regulated to ensure safety and proper fit within standard-sized cribs. When choosing a crib mattress, consider factors such as firmness, material, and waterproofing. By selecting the right crib mattress, you can provide your baby with a comfortable and safe sleeping environment.


– American Academy of Pediatrics: