How to Choose a Crib Mattress
The mattress is the most safety-critical part of the whole crib. Here’s how to choose one that’s safe, fits properly and lasts.
Ready to choose?
We compared 10 cribs on safety, convertibility, build, value and design - full-size, convertible, mini and travel cribs, for every nursery and budget.
Firmness and fit come first
Foam vs innerspring
- Foam: lighter and cheaper; choose a dense, firm foam (weight is a rough guide to density).
- Innerspring: often firmer and more durable; more coils and a firmer gauge generally mean better support.
Both can be excellent - firmness and fit matter far more than the type.
Breathability, dual-sided and covers
A waterproof, wipe-clean cover keeps it hygienic. Some mattresses are dual-sided - a firmer infant side and a slightly softer toddler side - which extends their life. Breathable designs can help, but they don’t replace the basics of firm and flat.
What to skip and when to replace
Skip soft ‘plush’ infant mattresses, toppers and any add-on padding. Replace a mattress that’s sagging, has gaps, or is being reused from years ago if it no longer feels firm or fits snugly. Match the mattress size to your crib (standard vs mini) - see our crib guide.
Ready to choose?
We compared 10 cribs on safety, convertibility, build, value and design - full-size, convertible, mini and travel cribs, for every nursery and budget.