A cot bed is a convertible baby bed designed to function as a standard crib from birth and then transform into a toddler bed by removing side rails, typically lasting from infancy to about 4–6 years old.
If you’ve come across the term “cot bed” while shopping for nursery furniture, here’s what you need to know: it’s not a camp bed. In UK and Commonwealth countries, “cot” means a baby bed with high slatted sides—what Americans call a crib. A cot bed is the convertible version, with removable panels that turn it into a toddler bed when your child outgrows the enclosed phase. For US readers, think “convertible crib” and you’ve got the right product.
How a Cot Bed Differs from a Standard Cot
The core difference is longevity. A standard cot (or crib) is a single-purpose piece of furniture that works from birth until roughly age 2, when the child can climb out. A cot bed adds removable side rails and a movable end panel, letting you convert it into a toddler bed that works until age 4–6—and some models stretch further.
The mattress sizes differ too. A standard cot mattress measures about 60 cm × 120 cm (24″ × 48″), while a cot bed mattress is larger at roughly 70 cm × 140 cm (28″ × 56″). That extra length gives growing toddlers room to stretch out during the bed phase. US full-size crib standards require interior dimensions of 28 ± 5/8 inches wide by 52 3/8 ± 5/8 inches long—similar to the cot bed measurements.
Cot Bed Safety Standards to Know
Safety regulations differ by region, and buying the wrong type can be risky. In the UK, cot beds must comply with BS EN 716 for the cot phase and BS 8509 for the bed conversion. Drop-sided cot beds require a lock mechanism marked BS EN 716:2005. In the US, the CPSC requires stationary sides on all cribs—drop-side cribs are effectively banned due to entrapment hazards discovered in the 2000s.
Universal safety rules apply everywhere: slat spacing must not exceed 2 3/8 inches (6 cm) in the US, the mattress must leave no gap wider than 3 cm (1.2 inches) around the edges, and mattress thickness should stay under 6 inches to prevent climbing. Always check the CPSC recall database before purchasing a used convertible crib.
The Cot Bed Timeline: Birth Through Toddler Years
| Stage | Age Range | Configuration |
|---|---|---|
| Infant Cot | Birth to ~2 years | Full side rails and end panel attached |
| Toddler Bed | ~2 to 4–6 years | Side rails removed; end panel lowered or removed |
| Extended Use | Up to ~10 years | Certain models with junior bed rails (like SnüzKot) |
The transition to toddler bed usually happens around age 2 or when the child reaches 35 inches in height (89 cm). Higher base positions in the cot phase should be lowered after 3 months to prevent climbing hazards.
Common Mistakes Parents Make with Cot Beds
The biggest error is regional confusion: searching “cot” in the US pulls up camping beds, not baby furniture. US parents should look for “convertible crib” or “crib-to-toddler-bed” instead. Mattress fit is another frequent issue—using a standard crib mattress in a cot bed frame leaves dangerous gaps over 3 cm wide, risking head entrapment during sleep.
Overstuffing the cot with pillows, duvets, or bumper pads under age 1 creates suffocation and strangulation risks that led to their removal from retail shelves. And keeping the mattress base at its highest position past 3 months is a fall risk once the baby starts rolling. Convertible cribs from brands like 4moms, IKEA SUNDVIK, and Babylets offer stationary-side safety with the same birth-to-toddler versatility.
References & Sources
- International Organization for Standardization. “ISO 7175-1:2019 — Children’s furniture — Cots and folding cots for domestic use.” International standard for cot safety, including dimensions and slat spacing.
- Australian Competition and Consumer Commission. “Safety alert — Cots.” Consumer guidance on cot entrapment and safe mattress fit.
- U.S. Consumer Product Safety Commission. “Full-Size Baby Cribs — Business Guidance.” Official US regulations for crib dimensions, slat spacing, and stationary-side requirements.
FAQs
Can you use a cot bed from birth?
Yes—cot beds are designed for newborn use with all side rails and end panels attached. The highest mattress base position works from birth until the baby starts rolling, usually around 3 months, then the base is lowered for safety.
Is a cot bed the same as a convertible crib?
Functionally, yes: both convert from an enclosed infant bed into a toddler bed. The term “cot bed” is standard in the UK and Commonwealth, while “convertible crib” is the US equivalent. The dimensions and safety standards differ slightly by region.
When should I convert the cot to a toddler bed?
The right time is when your child can climb out of the cot or reaches about 35 inches (89 cm) tall—usually around age 2. Converting earlier risks the child falling out of the larger opening, while converting too late invites climbing accidents with the rails still attached.