Cot and Bed Difference | Crib vs. Cot vs. Cot Bed, Explained

A crib is a stationary, regulated infant bed, while a cot in US usage usually means a portable folding bed—and a cot bed is a convertible crib that becomes a toddler bed.

Shopping for infant sleep spaces gets confusing because the same words mean different things in the US versus the UK and Europe. If you are in the US and see a listing for a “cot,” you might be looking at a travel product or an imported item needing careful checking. The real differences come down to regulation, size, and longevity. Here is what each term means, which standards apply, and how to match a mattress safely.

What Is a Crib in the US?

A crib is the standard stationary infant bed for home use in the US, and the only style of infant sleep enclosure with regulated interior dimensions for full-size models. Fixed sides are required, and design must prevent gaps that could trap a child.

Match the mattress to these regulated dimensions snugly. A standard US crib mattress measures about 28 x 52 inches, but the exact regulated interior number is what you match to avoid gaps. Buy the mattress after the crib arrives and measure the interior yourself before ordering.

What Does Cot Mean in America vs. Elsewhere?

In the US, a cot almost always means a portable folding bed for travel, camping, or temporary naps—not a full-time nursery crib. In the UK, Australia, and other Commonwealth countries, “cot” is the common term for what Americans call a crib. So a British product labeled a “cot” might be a standard infant bed, while a US “cot” is likely a camping-style folding frame.

This split matters when buying imported furniture. A product sold as a “cot” by an international brand may comply with EU standards but not automatically with US CPSC rules. If it is a full-size crib for the US market, it must meet 16 CFR 1219 or 16 CFR 1220, referencing ASTM F1169 and ASTM F406 standards.

What Is a Cot Bed and Is It Safe?

A cot bed is a convertible nursery bed that starts as a crib or cot for infants, then transforms into a toddler bed once the child is old enough—usually by removing one side rail or lowering the mattress platform to floor level. The benefit is that you buy one piece of furniture lasting several years instead of a crib and later a toddler bed.

In US regulation, a cot bed is not a separate safety category. The key question is whether the product meets the standard for a full-size crib or a non-full-size crib/play yard. Most convertible cribs sold in the US meet full-size crib standards in crib mode. Once converted, the product falls outside crib regulation—so only switch when your child is developmentally ready, typically around age 2 or when they can climb out.

Which One Should You Buy?

For a baby from birth to toddlerhood, a standard US crib meeting CPSC full-size standards is the straightforward choice. If you want a convertible option that grows with your child, a cot bed (sold as a convertible crib in the US) saves money long-term. Reserve “cot” for travel or temporary sleeping, where portability matters more than regulation.

For anyone beyond the crib stage, the word changes the product entirely. A cot bed for a preschooler or adult is a different purchase, and infant crib safety standards no longer apply. The National Institute of Child Health and Human Development’s Safe to Sleep glossary clarifies standard US infant sleep terminology.

When buying any infant sleep product, check the label for a CPSC compliance statement referencing the correct ASTM standard. Measure the mattress against the crib’s actual interior dimensions rather than relying on the label. For adults or older children needing a folding bed, infant regulations do not apply—so the best bed cot for adults comes down to frame strength, mattress comfort, and size. Our roundup of the best bed cots for adults compares top options across those criteria.