What Are the Dimensions of a Toddler Mattress?

When a child grows big enough to move on from the crib, the next step is often a toddler bed. A toddler bed mattress is typically the same size as a crib mattress, and sometimes the crib itself converts into a bed or daybed using the original crib mattress. The exact dimensions may vary slightly, but a mattress 27 inches wide and 52 inches long, on average, fits a toddler bed. The bed itself must not have space between the mattress and frame that could prove dangerous to a toddler.

Two little toddler boys having fun and fighting
credit: romrodinka/iStock/Getty Images
Two brothers laying next to each other in a toddler bed.

Mattress Safety Concerns

If you have a convertible crib or a crib conversion kit that turns the crib into a toddler bed, the mattress and bed frame already fit nicely together. If you need to buy a new toddler bed, the mattress must fit within the frame snugly -- not all crib or toddler mattresses are the same size, and the mattress may be a couple inches shorter than expected, resulting in an unsafe gap between mattress and frame. Measure the length from the head to foot area within the frame, and purchase a toddler or crib mattress that fits the space with no gaps large enough to trap fingers or arms.


Kathy Adams

Kathy Adams

Kathy Adams is an award-winning journalist and freelance writer who traveled the world handling numerous duties for music artists. She writes travel and budgeting tips and destination guides for USA Today, Travelocity and ForRent, among others. She enjoys exploring foreign locales and hiking off the beaten path stateside, snapping pics of wildlife and nature instead of selfies.