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What Size Is A Crib Mattress. Best Overall Guide

If you’re curious about what size is a crib mattress, it will depend on whether it’s standard or mini. This guide will explain the difference between these sizes to help you select the best one for your child. Much like other mattress types, even crib mattresses are offered in different dimensions. 

It’s useful to familiarize yourself with mattress sizing because it will benefit you when shopping or making a new one. Perhaps you’re cutting foam, or you’re looking for the crib itself. Nonetheless, it’s a simple topic to tackle, and you should know everything by the end of this article. 


what size is a crib mattress

How Big Is A Crib Mattress?


Standard crib mattress

As mentioned earlier, there are different sizes for crib mattresses. But if you want to find out what dimensions to expect for a regular crib mattress, the standard size is around 27 and 1/4 inches wide and 51 and ¼ inches long. The standard size crib mattress is also 6 inches thick, and the Consumer Products Safety Commission recommends these dimensions. 

You can expect that a standard-sized crib mattress will fit a standard-sized crib. However, it’s also possible to notice some difference in the fitting since the crib can be smaller or larger, depending on the brand. Some useful measurements to account for is the crib being smaller than 28 by 52 and ⅜ inches, or it can ⅝  of an inch more extensive than the typical crib size. 

Remember these variations from the regulated measurements when shopping for a crib and a crib mattress. You want the right fitting between the two as getting something too big or too small will be unsafe. Getting a large gap between the crib and mattress or having the mattress overfilling the crib is never ideal. 


Mini crib mattress

Besides the standard-sized crib mattress, there is a smaller size called mini. It measures 24 inches wide and 38 inches long, which is ideal for smaller cribs. However, there are no regulations for mini crib mattresses, so that the sizes will vary from every manufacturer,

As with shopping for a standard crib mattress, you must check both sizes of your crib and mattress to ensure that they have the perfect fit. For example, your crib mattress might have a depth that won’t work well with your crib’s size. A useful tip is to always select the mini crib with the same dimension as your crib mattress. 


Are there other crib mattress sizes available?

Since there are other crib sizes and shapes, you can expect different sizes for crib mattresses. However, expect more variations with shaped crib mattresses, unlike standard crib mattresses. It’s also common for these so-called shaped crib mattresses to already come with the crib you bought. 

Regardless of the crib and mattress you get, the tip mentioned previously applies to all. Get the size that is the same with your crib. Never get a mattress that is too big or too small, and always aim for a snug fit without spaces around the edges. 


Is A Crib Mattress The Same Size As A Twin?

A twin mattress will not have the same dimensions as a crib mattress. Instead, a toddler mattress will have the same size as a crib mattress. As for a twin mattress, you can find it in standard, short, and XL. 

A standard twin mattress measures 38 inches long and 75 inches wide. Of course, the shorter version will be smaller, but the sizes vary since it’s unregulated. If you want something bigger, a twin XL mattress would be best for teenagers because it’s a narrower version of queen and king mattresses. 


Does The Crib Mattress Fit A Toddler Bed?

A toddler mattress and a crib mattress usually have the same dimensions. Therefore, a crib mattress can fit a toddler bed. However, twin beds will be longer than toddler beds, with the latter serving as the transitional bed from a crib to a regular one. 


What Is The Difference Between A Crib And Toddler Bed?

A toddler bed is what you can use for your little one to transition from a crib to a regular bed. It’s the safe option for kids before using a bed because it is close to the ground but still encourages them to climb in and out themselves. Think of the toddler bed as an upgraded version of a crib, where you can also use a crib mattress.


When should my child use a toddler bed?

You can transition your little one to a toddler bed when he is around 18 months old. Some parents also do this around 24 months. Nonetheless, it’s best to transition when your child can climb out of the crib. 

There is no weight limit for a toddler bed, but you have to check the age and weight recommendations of the one you’re using. The mattress may also become too short for your child. Consider moving to a twin bed when your child turns 6 or 7 years old. 



Shopping for your little one’s mattress is easy, but there are some pointers to remember. For example, what size is a crib mattress? The standard and regularized one is around 27 and 1/4 inches wide and 51 and ¼ inches long. However, there are variations from different brands to fit various cribs. 

Since mini mattresses and shaped mattresses are not regulated, you can expect deviations with the dimensions to expect. You must always check if the mattress you’re getting fits snugly with your crib for your little one’s safety. 

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How To Test A Mattress

How To Test A Mattress? 4 Best Ways To Know

Suppose you’re unsure how to test a mattress, whether at the store or when browsing online; we have four practices to share! Remember that our beds are investments and we shouldn’t buy one without careful consideration. All of us deserve to get the most of our money, including the best sleep every night.

Are you curious about what to expect in this article? By the end of the reading, you’ll be familiar with what you should get and how you can test the bed according to your needs and wants. So without further ado, let us find you the best mattress!


How To Test A Mattress To Find The Best One


Know your needs and wants

Before you go to the store or browse through the internet for a bed, you have to be aware of your needs and wants. Let us start first with how you’ll know your needs in a mattress. For example, what is your sleeping position


Habits and body type

Those who sleep on their side should use a different mattress type than back sleepers and stomach sleepers. You also want to get the proper mattress for your body type to ensure that you stay well-supported throughout the night. Heavier individuals will sink quickly if they use a thinner mattress ideal for lighter people. 

Another question to ask yourself is if you have specific health conditions that must be addressed. Perhaps you need to sleep on a pressure-relieving material like memory foam. You might also be limited in mobility, so you’ll need a lower mattress to help you get in and out of bed easier. 


Size needed

Now that you know your physical health requirements, you need to consider your possible limitations in mattress sizes. For one, do you plan on sharing the bed with a spouse or family members? It should be spacious enough to be comfortable for everyone.

You also want to check the room size and if you plan on bringing the mattress for travel. Smaller rooms are better with a twin-size or full-size bed, and their dimensions are also comfortable enough to fit in the vehicle for travel. But if you have space and you won’t bring the mattress on camping and other trips, you’ll feel comfortable on a queen or even a king-size mattress. 


Personal preference

Finally, know your personal preferences in terms of comfort. This characteristic is different for every individual, so a mattress that feels comfortable to a particular user might not work for you. Some features to note are the bed’s firmness, thickness, and breathability. 



Once you have created a list of mattresses you might want to buy, you can compare them to find a clear winner. Find their common ground and how they differ, including the advantages of specific models over others. The manufacturer or retailer might also be offering something you’d like, including a better price or accessories included. 

If you are in the shop and don’t know what to ask the expert, you can start with the return policy, warranty, and sleep trial. These are all important when buying a mattress to ensure that you’ll get the most out of your purchase. You can also search for this information if you’re shopping online. 


Get physical

Since you can’t test the mattress physically if you’re shopping online, you can try to find reviews regarding these experiences. For example, a back sleeper can lie on the bed and check if there is no considerable gap between his lower back and the mattress, which means good support and lower risk of back pain. If you sleep on your side, you’ll check your spinal alignment as any curves can cause pressure over time. 

You can test the mattress as a stomach sleeper by checking for sagging when you lie in this position. You also want your shoulders not to be cramped. Remember that you must avoid very cushioned mattresses if you sleep on your stomach. 


Try snoozing

The final test you can do to the bed happens after you purchased it, and it is the sleep trial. Most brands offer returns if you’re not satisfied with your experience. Note if you feel well-rested and don’t develop muscle pain. 


What Are The Signs Of A Bad Mattress?

We all know that you must not buy the mattress if it has noticeable dents or lumps on the surface. There might also be damages on the mattress cover, or there is a pungent smell even though it looks clean. But more than a deformed structure or stinky odor, even the most expensive bed will become bad if you got the wrong one and it failed in the tests we discussed. 

If the retailer doesn’t offer reasonable return and warranty, it might also be a sign that they’re not confident with their product quality. More so, be on the lookout for their honesty regarding the mattress. If it happens to be used or has materials used, the bed should have the appropriate label to let the buyers know. 



Are you buying a new bed? In this article, we’ve taught you how to test a mattress to find the best one in the market. You have to know your needs and wants, compare, try it physically, and follow the sleep trial accordingly. 

Once the model passed these tests, you’ve hit the jackpot! If you want to know more tips, please let us know below. 


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