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How Do I Know If A Mattress Will Fit My Child’s Crib?

You want your baby to have a safe sleeping space and one important part of that is to have a crib mattress that correctly fits your crib. But how do you know if your crib mattress fits correctly?

Cribs sold in the USA have standardized size requirements. Crib mattresses are designed to fit snugly inside a crib. The best thing to do is to measure your crib to make sure it is in compliance. If it is, you should have no issue fitting a crib mattress snugly inside.

How do I measure my crib?

Measure the INTERIOR of your crib to the below specifications. If your crib measures any smaller or larger, you need to contact the crib manufacturer as your crib is not made to legal specifications.

Crib dimensions are dictated by ASTM and Federal Law. The dimensions in the crib standard require cribs to have interior dimensions of 28 +/- 5/8 inches wide and 52 3/8 +/- 5/8 inches long.

The inside of your crib should measure somewhere between 27 3/8 to 28 5/8 inches wide and between 51 ¾ and 53 inches long. Mattresses are designed to be slightly smaller to allow them to fit within these tolerances.

Posted February 3, 2011

by MichelleH

8 Comments

8 Responses

  1. Colleen says:

    We just bought a mattress for our daughter’s crib glad to know about the standard measurements, I will make sure everything fits snuggly when I get home! Thanks for the great information.

  2. Amy says:

    thanks for this useful information! i’m currently looking to buy a new crib and mattress! :)

  3. Stephanie says:

    Great post – very important information for parents to have!

  4. Katy says:

    I didn’t know that crib mattress came in different sizes. Thank you for the information!

  5. MichelleH says:

    You are very welcome Katy!

  6. Lori Thomas says:

    Very helpful & useful info ty…. also thnx for the great giveaway at Double Duty Mommy

  7. MichelleH says:

    Lori,
    We are very passionate about secure sleeping spaces for baby & we are very proud of our crib mattresses. Thanks for reading baby Matters blog & good luck with the contest!

  8. Eve White says:

    Thanks a lot for the information, it’s really helpful.

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