How Big Is A Baby Mattress

Helen Skeates
Helen Skeates
39 min read

Is it your wish that your sweet little one have a bed that is just the right size for them? Have no fear! You can learn the dimensions of a standard crib mattress here.

There are two common sizes for infant mattresses: regular and miniature.

The standard size is 28 by 52 inches, while the smaller size is 24 by 38 inches.

You’re going to do what’s best for your child, right?

So, without further ado, please continue reading!

How Big A Baby Mattress Is

Your infant will be spending a lot of time on the mattress, so make sure it’s a good one. It’s important to know how big a baby mattress should be.

Here are the two most common varieties of infant mattresses on the market today.

Standard size

Baby mattresses typically come in this standard size.

The maximum thickness for the mattress is 6 inches.

It’s 52 inches in length and 28 inches across.

These mattresses work great for cribs that are the typical size.

Here is the best resource I’ve found for learning about infant crib sizes.

Mini size

Baby mattresses are typically smaller in size than adult mattresses.

Common dimensions are 24 inches in width and 38 inches in length.

The comfort of your beautiful baby during sleep can be affected by the mattress depth you choose.

What Are The Things To Remember In Choosing A Baby Mattress?

There are a few things to keep in mind when shopping for a baby mattress, provided you have the right dimensions.

#1. Safety

Baby safety comes first, which is why the law restricts the dimensions of baby mattresses.

Its purpose is to keep babies from suffocating or having their heads get stuck between the crib and the mattress.

Keep in mind that the mattress you already have fits perfectly inside the crib.

Unless it is a designated crib mattress, using it with care will help.

Foam toppers and other unregulated mattress protectors should be avoided for use on infant crib mattresses.

Your baby will be safer this way.

#2. Firmness

Babies should sleep on firmer mattresses rather than soft ones. Babies should not sleep on soft surfaces because of the risk of suffocation.

Diseases like Sudden Infant Death Syndrome (SIDS) may be more likely to develop as a result.

Pressing on the mattress’s center and edges is a good way to gauge how firm it is.

The mattress should snap back quickly after the force is removed.

#3. Non-toxic

Keep in mind that your baby will most likely spend the first few years of their life on the mattress.

Choosing a natural or organic mattress may help. Check for GOTS certification, which stands for the Global Organic Textile Standard.

Therefore, it is suggested that they have a healthy and secure environment.

Furthermore, GOLS (Global Organic Latex Standard) certification is an option.

#4. Weight and depth

The depth of some mattresses is irrelevant to the level of firmness they provide.

The depth of a foam mattress is typically between 4 and 6 inches, while a mattress with coil springs is 5 to 6 inches deep.

Foam mattresses, with the exception of memory foam mattresses, tend to be on the lighter side.

#5. Length of use

There aren’t a lot of mattresses that can be flipped over to have a softer side for a baby and a firmer side for a toddler.

Double-sided mattresses, also known as two-stage mattresses, clearly indicate which side should be used.

#6. Cost

A high-quality crib mattress can be purchased for $90-$200.

Organic and hypoallergenic options may cost more, but they are worth considering.

#7. Covers

The surface of most infant mattresses is protected by a cover to prevent damage from diaper leaks and other accidents.

Choose the more secure water-proof, breathable, and hypoallergenic options if you want a good, dependable cover.

Covers with plastic seams should be avoided due to the potential for injury. Also, check the seams to see if the fabric has been stretched or strained.

To My Parents, You should buy two mattress protectors in case your baby has an accident in the crib.

#8. Buy new

Baby mattresses that have been soiled, mistreated, or are old should be avoided at all costs.

An old mattress may harbor molds, which can be harmful to your baby’s health.

You should upgrade to newer models to avoid these dangers.

#9. Consider border rods

Innerspring baby mattresses should have border rods to prevent the mattress from sagging.

They usually wrap all the way around the upper and lower edges of the bed.

Stronger firmness, durability, and support can all be gained from using border rods.

The 9 Best Crib Mattresses for Babies and Toddlers


Newton Baby Crib Mattress and Toddler Bed



Things We Dig

  • Cooling
  • Simple to clean
  • Light but supportive

The Things That Bother Us

  • There may be an initial strong plastic smell, but users have reported that it disappears after washing.

Our research has led us to conclude that the Newton Baby Crib Mattress is the best option for a good night’s sleep. The risk of suffocation and carbon dioxide rebreathing is greatly diminished thanks to its cutting-edge breath-through technology. This feature helps keep your infant at a comfortable temperature all night long.

The removable cover and the mattress itself can both be cleaned easily. Allergy-stricken parents can rest easy knowing that this crib has been made without the use of any foam, glue, latex, or springs. GreenGuard Certification ensures low chemical emissions from manufacturing processes, and Newton Baby’s use of recycled materials further demonstrates the company’s commitment to environmental responsibility.

Parents who have purchased this mattress have expressed their gratitude for its breathable construction and cooling properties, which have alleviated their concerns about their child overheating in the middle of the night. Parents can rest assured that their little one is safe sleeping on their stomach on this option. The Newton Baby mattress is expensive, but it can be used from birth through the toddler years.

Some reviewers have mentioned that there is a noticeable plastic odor once the product is opened. Thankfully, it seems to disappear after the first washing.

Dimensions dimensions of 52 by 28 by 13.5 cm |Materials recyclable polymer used in the food industry | Thickness: 15.0 cm |Cover?: Yes | Warranty Everlasting |Certifications “GreenSeal Gold” Certification

Graco Premium Foam Crib and Toddler Mattress

Thanks to


Things We Dig

  • Sturdy and reassuring
  • Includes a case for safekeeping
  • Excellent worth

The Things That Bother Us

  • Preparation involves fluffing and expanding.

The Graco Premium Foam Mattress is a great option for parents on a budget who still want to give their child a safe and comfortable place to sleep. This mattress has been tested for more than ten thousand volatile organic compounds (VOCs) and chemicals known to pollute indoor air washing machine-safe cover in case there are any mishaps or spills.

The memory foam is both breathable and supportive, making it ideal for infant use. This mattress, which is compressed in a box for easy transport, will need a few hours to fully expand before it can be used. After that, you have a durable and comfortable bed that will last for many years.

Dimensions 52 by 27 by 5 cm |Materials: Foam | Thickness Size: 5 inches |Cover?: Yes | Warranty: 6 years |Certifications: CertiPUR-US, GreenGuard Gold

Naturepedic No Compromise Organic Cotton Classic Crib Mattress

Thanks to Amazon.


Our Favorites

  • Layer of watertight protection
  • Natural and harmless
  • Very firm

Disliked Features

  • Possible eventual sinking

If you buy a Naturepedic crib mattress, you can rest assured that it is made entirely of organic, non-toxic materials. This alternative is strong and portable despite not utilizing standard springs. The flammability and sustainability requirements for farming and chemical emissions are met by the breathability materials.

Your baby will be secure all night long thanks to the wide base and sturdy sides. The waterproof lining keeps moisture out and critters like dust mites and insects at bay. In the event of any accidents, you can easily clean your mattress by wiping it down.

Dimensions 52 by 27.5 by 6 inches | Materials Product Name: Cotton |Thickness Size: 6 inches |Cover?: No | Warranty: 8 years |Certifications GOTS, GreenGuard, UL

Information on Antique Cribs

Our Favorites

  • Dual-sided
  • Safe and natural
  • Strong and durable

Disliked Features

  • Costly considering how little time it will actually be used

Choose an organic mattress, like this one from Avocado, to give your child peace of mind that they are not sleeping on chemicals or toxins. It’s a breathable and soothing place for your baby to sleep thanks to the combination of latex, wool, and cotton.

Avocado claims to protect your child and the environment by sourcing its wool and cotton sustainably in India without the use of pesticides, herbicides, or fertilizers. Although the 28-pound mattress made from all-natural materials is more durable and comfortable in the long run, it is noticeably heavier than the alternatives on the market. This option may be cumbersome and expensive, but it’s well worth it because of its hygienic construction and design, which can be used by infants and toddlers alike.

Dimensions Dimensions: 52 x 28 x 6 Materials Organic Dunlop latex (GOLS) and cotton (GOTS) and wool (GOLS) | Thickness Dimensions: 6″ | Cover?: Yes | Warranty: 25 years | CertificationsClass 1 OEKO-TEX®, GreenGuard Gold Certified

How To Choose The Right Crib Mattress Size: The Complete Guide

Our Favorites

  • Excellent durability over time.
  • Comfortable firmness
  • Dual-sided

Disliked Features

  • Weak feeling about the waterproof coating.

Babies can sleep more soundly on a softer crib mattress as they grow older. This Moonlight Slumber mattress has two distinct sides, so rather than buying two, you can save money by using it through both of your child’s developmental stages. The extra-firm plant-based foam on one side is great for newborns. The other is made of super cushy foam that even infants will love.

The stretch knit fabric is made to medical standards, so it can be used repeatedly without losing its shape or becoming unsanitary. This mattress is safe for your baby because it does not contain PVC, phthalates, lead, antimony, vinyl, or any other substances that could cause skin or respiratory irritation while they sleep. In case of mishaps, the included waterproof case is a welcome addition.

Dimensions 52 by 27.5 by 5 inches | Materials Quality Foam for Medical Use | Thickness Inches: 5 |Cover?: Yes | Warranty: 8 years | Certifications: None

Our Favorites

  • Long-lasting
  • Waterproof
  • Environmentally-friendly

The Things That Bother Us

  • At first, some people noticed a faint chemical odor.

It is important to find a crib mattress that allows air to pass through so that your baby can continue breathing even if they roll over onto their stomach during the night. This option is a safe bet because it contains high-quality foam that has been certified as non-toxic and hypoallergenic.

The mattress won’t get stained if liquids spill on it because the waterproof backing is present on both sides. As its name suggests, Colgate’s Eco Classic Mattress is an eco-friendly option because it is made with “eco-foam” infused with plant oils. The nontoxic, lightweight, and firm compositions make this an excellent purchase.

Dimensions the dimensions are 52 by 27.75 by 6 inches |Materials Cloth | Cotton Thickness Dimensions: 6″ |Cover?: Yes | Warranty: Forever | Certifications GreenGuard Gold, CertiPUR-US, etc.

Our Favorites

  • Bottle-bottle recycled
  • thicker than the leading alternatives
  • Sufficiently firm for newborns.

Disliked Features

  • Not a lot of chill

Miniature mattresses for cribs are available, but they still need to meet all of the same safety standards as full-size mattresses. The Serta SleepTrue Mini Crib Mattress from Delta Children has everything we look for in a crib mattress, including a nontoxic build, waterproof cover, and 10-year guarantee.

The four-inch-thick, firm fiber core is manufactured from post-consumer plastic bottles and provides maximum support for your baby. This mattress will serve you well until your child outgrows it, thanks to its two usable sides. This lightweight option is also convenient for traveling.

Dimensions A size of 38 by 24 by 4 inches | Materials Fiber interior, vinyl exterior |Thickness Size: 4 inches |Cover?: Yes | Warranty: 10 years | Certifications “GreenSeal Gold” Certification

Our Favorites

  • Durable
  • Affordable

Disliked Features

  • Making a racket under cover

If you value a clean sleeping environment for your baby, investing in a waterproof crib mattress or cover is essential. It’s much simpler to clean up any accidents or spills without worrying about damaging or staining the surface. This Sealy option is highly recommended due to its waterproof, lock-stitched cover that is both antimicrobial and odor-resistant.

This innerspring option features heat-tempered interlocking steel coils to keep your baby comfortable and cool all night long. The heavy gauge steel border rods around the entire bed’s perimeter also prevent the user from sinking to any one side or becoming trapped. The cover may make some noise during the night, but the benefits of its cleanliness are well worth the inconvenience.

Dimensions size (inches): 51.63 x 27.75 x 5 Materials Polyurethane | Thickness Inches: 5 | Cover?: Permanent |Warranty: 10 years | Certifications Award for Environmental Stewardship, Gold Level

Our Favorites

  • Hypoallergenic
  • Cleanup is a breeze
  • Waterproof

Disliked Features

  • The sides aren’t nearly as sturdy as competing designs.

Mattresses with innerspring coils are exceptionally firm, durable, and long-lasting. Infants can’t sink to the bottom or tip to one side thanks to the coils. Comfortable for toddlers because of the springiness that allows it to conform to their bodies.

The non-removable cover on this Kolcraft mattress is both watertight and stain-resistant, so cleanup is a breeze. The cover isn’t removable, but rest assured that your young child will be safe and comfortable thanks to the use of hypoallergenic and breathable materials.

Dimensions Dimensions (inches): 51.63 x 27.25 x 5 Materials: Foam | Thickness 1.25 meters  | Cover?: Permanent | Warranty: 10 years | Certifications Green Seal Gold

What to Look For in a Crib Mattress


It would be unfortunate to order a mattress for your child’s crib only to find out that it does not fit. The typical dimensions of a crib are 28 by 52 inches. There should be no space between the mattress and the crib’s walls. According to registered nurse Lindsay Albutt, this prevents your infant from becoming wedged between the mattress and the side of the crib. She explains that the American Academy of Pediatrics agrees with these suggestions: “These are all recommendations supported by the AAP.

A standard crib mattress will not fit in a mini or portable crib. Mini crib mattresses should fit inside a space measuring no more than 24 by 38 inches. This is the first step in creating a cozy and secure nursery for your newborn.


Foam, cotton, wool, and polyester are just some of the materials used to make crib mattresses. It’s not just the material itself, but how it’s put together, that matters. Make sure the crib you buy is made from non-toxic, chemical-free materials to protect your child’s health while they sleep. When you go shopping, keep an eye out for labels that say things like “organic,” “non-toxic,” and “hypoallergenic.” This ensures that your child’s mattress will not cause any allergic reactions.

The temperature you feel while sleeping may also be influenced by the mattress’s material. If your infant tends to get hot easily, you may want to invest in a special mattress designed to keep them cool.


Albutt explains how you can help prevent SIDS by putting your baby to sleep on their back on a flat, firm surface. Her findings suggest that unsafe sleeping conditions account for 72 percent of the annual 3,400 SUDI deaths. Taking even simple precautions to ensure your child’s safety at night is crucial.

Mommywise creator Natalie Nevares says, “Firmness ensures that when babies inevitably roll over, they won’t suffocate.” This does not mean that comfort must be sacrificed. She goes on to say, “If I wouldn’t want to sleep on the mattress, I don’t want my baby sleeping on it.”


Nevares states that when looking for a crib mattress, breathability and firmness are her top priorities. Most mattresses are designed to allow airflow even if flipped onto their stomach, so you can rest assured your baby will be able to breathe while they sleep. Although some fabrics are inherently more breathable than others, it’s always preferable to choose a product that advertises itself as lightweight and breathable.

According to Elizabeth King, CEO and founder of Sleep Baby Consulting, “avoid anything with pillow tops or comfort tops as they can lead to a sleeping area that is too soft.” “Baby’s face can get trapped in these squishy places, which can make it hard for them to breathe,” she says.

These Mini Crib Mattresses May Be Small In Size, But They're Big On Comfort


Crib mattresses aren’t always essential for baby safety or comfort, but they can be a selling point if they’re made with eco-friendly materials and follow sustainable production methods. You should look for a firm, Greenguard Gold Certified mattress when shopping for a crib for your child. Certified sleep consultant Kaley Medina explains that purchasing a mattress with this label means that you can rest assured that it has minimal chemical emissions within. In other words, these materials are both baby- and planet-friendly.


Waterproof crib mattresses can be quickly cleaned after an accident by being wiped down or put in the washing machine. Some of the items on this list have waterproof covers that are permanently attached and stitched together. Some have parts that can be taken off and washed, replaced, and reused. Waterproof covers can be added to any of the items on this list to make maintenance a breeze.

Keep in mind that waterproof coverings frequently make a lot of noise or crinkle. The plastic or vinyl they’re usually made of means they might not be the most pleasant thing to sleep on. If a waterproof cover isn’t built into the mattress, it’s a good idea to do some research before making a purchase. A mattress’s organic, non-toxic claims may not extend to the mattress’s waterproof cover, even if the brand makes those claims. Having gone to the trouble of finding a non-toxic, organic, allergen-free mattress, the last thing you want to do is cover it with something that isn’t as clean or safe.


How do you clean a crib mattress?

Most crib mattresses are antimicrobial. Most of the items on this list can be cleaned quickly and easily by tossing them in the washing machine once a week or after any accidents. There are also options with waterproof covers that can be easily wiped clean to prevent liquid from seeping through. Before you dive in, it’s a good idea to familiarize yourself with the cleaning procedures.

Do crib mattresses make a difference in a child’s sleep?

Both Medina and Navares agree that your child’s sleep is not primarily affected by the quality of the crib and mattress. However, a great first step is to make your baby’s environment safe and pleasant. Teaching your child to fall asleep without the aid of sleep associations or sleep props is, according to Medina, the single most important thing you can do to get your child sleeping well. Making sure your baby is secure and comfortable in his or her crib will help your child adjust to sleeping there.

‘Sleep and development go hand in hand,’ Nevares explains. Once they begin getting sufficient, high-quality sleep, they will experience a dramatic increase in growth. Finding the right mattress for your baby, or anything else you can do to improve his or her sleep, will help your child grow and develop.

What do babies need to sleep?

A good, flat mattress and a fitted sheet are necessities for a baby’s crib. If the baby rolls onto their stomach, the sheet needs to be as snug as possible on the mattress to keep them from suffocating. For the safest sleep, Medina recommends having only the mattress and the fitted sheet in your baby’s crib, and nothing else (including mobiles, blankets, stuffed animals, toys, bumpers, etc.). Since a baby only needs a few things to fall asleep, it’s crucial that what they do have be of the highest possible quality and safety.

The Bottom Line

Great! A crib mattress’ dimensions have just been revealed.

Mini and standard are the two most common sizes.

Sizes range from 24 to 34 inches in length for the smaller ones, to 28 and 52 inches for the larger ones.

If you’re in the market for a new mattress, it’s a good idea to give some additional thought to the following considerations.

I trust this information was helpful in addressing your inquiry.

If you know any parents who are worried about the safety of their infants’ mattresses, please pass this information along to them.

Helen Skeates

Helen Skeates

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