Just like cribs, crib mattresses come in different sizes. Looking at a mattress, you wouldn’t know, so we’re here to answer the question “Are all crib mattresses the same size?”. We’ll also explain why crib mattress size matters!
There are so many styles of cribs on the market - modern, traditional, convertible, designer, bare-bones, take your pick! No matter the design, any crib manufactured and sold in North America, must be built to fit a full size crib mattress. So, what are the dimensions of a crib mattress and how long is a crib mattress?
All North American crib mattresses must measure between 51 ⅝ to 53 inches in length and 27 ¼ to 28 inches in width (thickness can range from 4 to 6 inches).
There are three main reasons:
Fit: If you can place more than two fingers between the mattress and the crib, the mattress is too small. Some mattress brands use smaller dimensions to cut costs.
Firmness: Foam that’s too soft or bouncy inner springs can contribute to a mattress with too much “give”, leaving gaps around the edges. This poses a safety hazard if tiny hands or feet, or even worse, baby’s face, gets caught between the mattress and crib rails.
Materials: What your crib mattress is made of plays a major part when it comes to how a mattress will fit in the base of the crib, like the aforementioned soft foam or inner springs.
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