Crib Mattress Sizes (Dimensions Guide)

Welcoming a baby can be an exciting yet overwhelming experience. Aside from picking out clothes, baby bottles, and other necessities, future parents must set up a nursery room or space. Among the major purchases for this room is a crib mattress. Babies spend at least 14 hours sleeping in a day, and like adults, the quality of their beds affects their sleep and safety.

In addition to the design and comfort features, you must choose the right crib mattress size. As you read through our comprehensive baby mattresses sizes guide, arm yourself with all the information you need.

Standard Crib Mattress Size

According to the US Consumer Product Safety Commission or CPSC, full-size crib mattresses follow a standard dimension of at least 51 ¼  x 27 ¼  x 5 inches.

This snuggly fits the interior measurement of full-size cribs, which is around 28 ⅝ in width x 52 ⅜ in length. 

The narrow gap between the crib and the mattress lessens the likelihood of head entrapment and suffocation should the baby roll over to the side. A standard mattress can last you for at least 18 to 24 months. 

Non-full-size baby cribs do not follow a standard measurement as they vary in shape and proportions. 

Full Size Crib vs Mini Mattress Dimensions

Anything smaller than a full-size crib is considered a mini. Unlike full-size, mini cribs have mattresses measuring at least 38 inches x 24 inches. Their thickness ranges from one to six inches. 

Mini’s are flexible. You can fit them in small nurseries or in your bedroom. Some even come with wheels and are lightweight. But most importantly, they are portable and budget-friendly, too.

On the downside, finding sheets for mini cribs is tricky as their size varies and may not be widely available. Mini’s with wheels can also be unstable, so don’t forget to lock them for safety.

Crib vs Twin Bed Size Mattress

As babies grow, their beds need to adjust too. Once they turn three, they become more mobile and risk falling when they climb their cribs. Switching to toddler beds may prevent this risk.

Conveniently, a full-size crib mattress is compatible with most toddler beds. Some cribs are savvy and can turn into toddler beds or day beds. Compared to crib mattresses, a twin bed measures 75 in x 38 in and is at least 8 inches thick. These mattresses are firm to avoid suffocating your baby.

While twin mattresses have more comfort layers, making them softer and more appropriate for toddlers or older kids. Twin beds are big enough for kids aged four years old and up. If you choose this route, remember to go for a low-height bed frame or add a rail guard to prevent your child from falling.  

Below are the following selections of mattresses from reputable baby brands. 

Delta Children Mattress Size

Delta Children is an established furniture brand for kids that carries two main models: Natural Slumber Two-Stage and Cool Lux Two-Stage crib. These mattresses are 52in x 27.5in x 5in, perfect for full-size cribs. 

Delta Children produces mattresses using natural materials like waterproof woven fabric, fireproof natural cotton, and cotton foams. Their Cool Lux mattress contains a cooling gel memory foam for maximum comfort.

In addition, they have a limited edition Twinkle Stars bed that you can purchase from Amazon.

They have co-created mattresses with other brands like Serta and Beautyrest that are full-size and vary only in thickness and materials. 

IKEA Mattresses For Cribs

IKEA is the number one choice for affordable furniture finds, including cribs and mattresses. Despite their low prices, IKEA crib mattresses adhere to the US safety standards down to a tee. 

All their crib mattresses are 27 ½ inches x 52 inches and are compatible with non-IKEA full-size cribs, too. The options only vary in thickness and materials depending on the model you choose.

Below are some of their crib mattresses.

• Krummeleur bed: 27 ½ in x 52in x 3 ⅛ in 
• Pelleplutt bed: 27 ½ in x 52in x 2 ¾ in thick
• Jattetrott bed: 27 ½ in x 52in x 4 ¾ in thick

Pali Mattress Measurements

With over 100 years of furniture making, the Italian brand Pali is known for its traditional and durable cribs. They are made from solid wood and are long-lasting.

Some Pali cribs can also be transformed into toddler beds, child’s day beds, or full-size beds. They have an adjustable feature with three height settings.  

Unfortunately, you need to purchase the mattress somewhere else. Pali cribs range from 54 inches x 29.5 inches to 60 inches x 32 inches and are compatible with most full-size mattresses in the market. 

DaVinci Mattress Measurements

Featured as one of the best baby brands by Forbes, DaVinci manufactures cribs using sustainable pinewood. To complete the look, you can purchase GREENGUARD Gold certified mattresses from mini to full-size crib mattresses fit for their DaVinci Jayden Cribs. 

Their Deluxe Coil Dual-Sided and DaVinci Complete Slumber Waterproof mattresses come in full-size and mini dimensions. 

Deluxe Coil Dual-Sided Mattress: 

• Full-size: 52in x 27.75in x 5.5in 
• Mini: (7.5lbs): 37.5in x 24in x 4in 

DaVinci Complete Slumber Waterproof Mattress:

• Full-size: 52in x 27.75in x 5.5in 
• Mini: (8lbs): 37in x 24in x 4.50in

Baby Bjorn Travel Mattress Sizing

A Baby Bjorn Travel Crib is a mini sized product that is great for quick trips, like when you’re visiting grandma. This lightweight accessory is easy to set up in less than a minute.

The PU mattress for this travel cot is thinner, measuring 24 inches x 41 inches x 1.2 inches. When not in use, you can fold and tuck it away. 

Keep in mind that travel cots are best for short naps. Long hours of sleep require a more solid surface for optimum body support. 

Aside from choosing the right crib mattresses, improve your baby’s sleep by soundproofing the nursery. Like babies, parents also deserve a good night’s sleep. Visit our comparison guide for different types of mattresses.