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How Thick Should a Baby Mattress Be? Your Comprehensive Guide

From the Puffy Editorial Team | 3 min read.
How Thick Should a Baby Mattress Be? Your Comprehensive Guide

Welcome, new parents and guardians! You're reading this, which means you're knee-deep in the journey of parenthood, wading through baby gear catalogs and safety guidelines.

Among all the cribs, onesies, and baby monitors, one thing stands out: the mattress. More importantly, how thick should a baby mattress be? Let's dive into this pressing question, covering everything from general guidelines to the science behind these recommendations.

Table of Contents

How Thick Should a Baby Mattress Be?

When you're scouring the market for baby mattresses, thickness might seem like an arbitrary feature. But in reality, the thickness can play a significant role in your baby's comfort and safety.

General Guidelines

  1. Safety Standards: Always check that the mattress meets safety standards set by organizations like the Consumer Product Safety Commission (CPSC).
  2. 4 to 6 Inches: Most pediatricians recommend a mattress thickness between 4 to 6 inches.
  3. No Gaps: Make sure that the mattress fits snugly within the crib frame to eliminate any gaps where a baby's hand or foot could get stuck.

Expert Tip: Thinner isn't always better. A mattress that's too thin could lack the necessary support, while one that's too thick might not fit securely in the crib.

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

Is a 2-inch Thick Mattress Enough for a Baby?

The simple answer? It's usually not recommended. While a 2-inch thick mattress might seem convenient and light, it often fails to meet the comfort and safety requisites for babies.

Why 2 Inches Often Falls Short:

  1. Inadequate Support: A 2-inch mattress is unlikely to provide the kind of firmness that's generally recommended for infants.
  2. Lack of Durability: Thinner mattresses tend to wear out more quickly, meaning you'd need to replace them sooner.

The Science Behind Baby Mattress Thickness

Let's get geeky for a moment. What science and studies say could give you more clarity than you think.

  1. Spinal Support: Infants require solid spinal support, which is something a 4- to 6-inch thick mattress can provide but a 2-inch often can't.
  2. Breathability: Research has found that firmer, thicker mattresses can also help with air circulation, reducing the risk of Sudden Infant Death Syndrome (SIDS).

Material Matters: What You Should Know

Material not only affects comfort but also safety and durability.

  1. Foam vs. Innerspring: Foam mattresses are generally lighter but make sure they are firm enough. Innerspring mattresses offer great support but are heavier.
  2. Organic Options: Organic mattresses are free from harmful chemicals but can be pricier.


Choosing the right mattress thickness for your baby isn't just a matter of personal preference; it's a matter of safety and comfort. Aim for a mattress that's between 4 and 6 inches thick and always check for safety certifications. Happy parenting and sweet dreams for your little one!

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.

And that's the long and short of it - everything you need to know about how thick a baby mattress should be. With this guide, you're one step closer to setting up a sleep sanctuary that's as safe as it is cozy.

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