02D24E7D-67D3-4337-92AC-2BC3D8171DB7 Yes A72A1DAE-6539-461D-A000-4179652AA390
June Sale: $1,350 in savings
0 1
Copy Discount Code

Code copied successfully.

Baby Mattress Size: A Comprehensive Guide

Baby Mattress Size: A Comprehensive Guide

Selecting the right mattress size for your baby is more than just a matter of fitting a rectangle into another rectangle (the crib, in this case). The size of the mattress can influence your child's comfort and safety. This article will delve into the various aspects of baby mattress sizes to help you make an informed decision.

Table of Contents

What Size is a Baby Mattress?

When you find yourself in the baby section of a department store, it's easy to get overwhelmed. So let's clear the air. Generally speaking, the size of a standard baby mattress is 27 1/4 inches wide and 51 5/8 inches long. However, variations exist.

Takeaway: Knowing the specific needs and constraints of your situation can guide your choice effectively.

Standard Baby Mattress Size

The Consumer Product Safety Commission (CPSC) has guidelines for standard baby mattress sizes. According to the CPSC, a full-sized baby crib mattress must be at least 27 1/4 inches wide and 51 1/4 inches long, with a thickness not exceeding 6 inches.

Takeaway: Always cross-check mattress dimensions against the CPSC guidelines to ensure safety standards are met.

How Big is a Baby Mattress?

It's not just about length and width. The thickness of the mattress also matters. Most crib mattresses are between 4-6 inches thick. A thicker mattress doesn't necessarily mean it's more comfortable; it could even pose a safety hazard if it lifts too high against the crib's guardrail.

Takeaway: Thicker isn't always better. Safety guidelines should always be the priority.

How Long is a Baby Mattress?

The 'longevity' of a baby mattress can also be a concern. Most standard crib mattresses will last until your child is ready for a toddler bed, around age 2-3.

Takeaway: Always check the warranty and material quality to gauge how long a mattress will last.

Check out Puffy mattress reviews from real customers and see how we compare with other brands.

Baby Mattress Size Variations

While standard sizes exist, there are variations:

Takeaway: You’re not restricted to the traditional rectangle if you’re looking for something more specific.

Custom Baby Mattress Size

If standard sizes aren't working for you, custom sizes are an option. Many brands offer this service, but keep in mind:

Takeaway: Custom sizes offer a tailored fit but come with their own set of challenges.

What to Consider When Choosing a Baby Mattress Size

In choosing a mattress, consider:


Choosing the right baby mattress size involves various factors, including room dimensions, crib size, and even your child's growth rate.

Use our store locator to find the closest furniture or mattress store near you and feel the cloudlike comfort of our Puffy Mattress in person.

Always stick to the safety guidelines outlined by the CPSC and consider the longevity of the mattress. Make an informed decision, because your child's comfort and safety should always come first.

Get Your Puffy Cloud Mattress

article ad savings icon $1,350 in savings

Upgrade your sleep with the Puffy Cloud.

Sink into cloudlike comfort with:

  • 6 layers of award-winning luxury.
  • Medium-firm feel.
  • Responsive memory foam.
  • 101-night sleep trial.

Shop the award-winning Puffy collection.

puffy mattresss

Choose your award-winning mattress.

Experience the cloudlike comfort and support of our hybrid and memory foam mattresses.

  • 4 luxury mattresses
  • All sleeper types
  • Made in the USA

Prices start from $599

puffy bed frame

Customize your comfort with a bed frame.

Upgrade your sleep with our stylish and supportive bed frames, bases, and foundations.

  • Support for all mattresses
  • Adjustable comfort options
  • Quick and easy setup

Prices start from $152

puffy beddings

Elevate your sleep with luxury bedding.

Add luxury to bedtime with our silky soft sheets, protectors, blankets, and more.

  • Premium materials
  • Contemporary style
  • Ultra-soft comfort

Prices start from $59


Puffy is ranked America’s #1
luxury mattress.

Hear from
satisfied Puffy sleepers about why they give our award-winning comfort 5 stars.


Find official Puffy
mattress stores near you.

Try out the cloudlike comfort of the luxury Puffy mattress collection before you buy at our partner stores across the USA.


Save $1,425 when you buy any Puffy mattress. Verify your eligibility for our: