Crib Mattress Dimensions

You need to compare the crib mattress dimensions with the dimensions of your baby crib in order to determine if it's the right and safe fit.

A standard baby mattress will have the following dimensions:

  • Length = 51 5/8 inches
  • Width = 27 1/4 inches
  • Height/Thickness = no more than 6 inches

But keep in mind, many crib mattresses will have slightly different dimensions. This is ok, only if the mattress fits very tightly in the crib. Meaning, you should not be able to fit two finger widths between the mattress edges and the inside of the crib. Otherwise, the mattress is too small (or crib is to big) and this is a potential safety hazard for your baby.

These crib mattresses may be the right fit for your baby crib:

  • Serta Nightstar Eco-Friendly Firm Crib Mattress
  • Simmons Kids Beautyrest Beginnings Firm Baby Crib Mattress
  • Colgate Classica I Foam Crib Mattress
  • Naturepedic No Compromise Organic Crib Mattress

    Parents need to understand that baby limbs are very tiny, and as result they may get caught in between even very small spaces. That's why I recommend that you measure the mattress prior to placing it into the crib.

    Summary of suggested procedures: