What is The Standard Crib Mattress Size?

Putting up a nursery is one of the most important things a mother can give to her child. However, just like you, your child also needs a comfortable place where he/she can sleep and play.

While you’ve probably suffered from the mattress you have purchased, you may possibly inclined to concede to a crib set for your baby and not consider much about it. Actually, giving you little one a safe and right crib mattress is very important. Since it is where your child stays for a couple of years.

But the question is, what would be the standard crib mattress size for babies. Thus, if you’re planning to buy a crib mattress and want to know the right crib mattress size for your baby, then this content is for you.

The Standard Crib Mattress Size

Unlike mattresses for adults, the size of a crib mattress really matters. As a matter of fact, crib mattresses’ size is specifically regulated by the industry as well as federal government to make sure that your baby has a safe sleeping environment.

The CPSC or Consumer Products Safety Commission requires that full-size crib mattresses for babies must be at least 51 and 1/4 inches in length and 27 and ¼ inches in width. In addition, a crib mattress, on the other hand, must have a maximum thickness that is not more than six inches.

Even so, the reason why the size of crib mattresses have been standardized under deferral regulations is to avoid suffocation between the crib sides and mattress as well as avoid head entrapment.

Either way, the established standard crib mattress size, will safely and perfectly fit in full-sized cribs.

However, if you are planning to buy a crib mattress it is very easy to determine if your chosen model meets the standard size set by CPSC since the measurements are listed in the assembly instruction and in the retail box.

Other Important things to Consider When Buying a Crib Mattress

Aside from checking if a certain crib mattress meets the standard size, there are also other important things that you need to consider when shopping for one.


Look for a crib mattress that is stable as it reduces the possibilities of suffocation as well as offers a safe and comfortable sleeping platform.

Cost and Quality

Not all expensive crib mattresses are great and not all inexpensive models have poor quality. That is why, when buying a mattress make sure to check its quality. If you think it is too costly then check if it is made of high-quality materials and safe for your baby and same goes through to cheap models.

In addition to the firmness, cost, and quality, when buying a crib mattress you should also consider the ease of cleaning, durability, support, breathability, and comfort.


We hope that this article will help you a lot in choosing the right crib mattress for your baby. Nevertheless, when buying for one make sure that the mattress meets the standard size which is 27 ¼ inches (width) by 51 ¼ inches (length).