Just make sure you choose a firm and safe mattress for the crib.
Baby bed size standard.
The full size baby crib standard currently incorporates astm f1169 19 standard consumer safety specification for full size baby cribs approved on march 15 2019 as the mandatory cpsc standard.
At least 27 1 4 inches by 51 5 8 inches and no more than 6 inches thick.
Although there are usually no problems with fitting there is a bit of wiggle room within the regulations.
Standard crib mattress is a baby crib with the following measurements.
The consumer products safety commission defines the standard size for a full size baby crib as 28 inches wide by 52 3 8 inches long plus or minus 5 8 inch for both width and length 2 5.
52 3 8 5 8 inches in length by 28 5 8 inches in width any new full size crib mattress fits into any new standard size baby crib.
At a minimum the mattress should be 27 1 4 inches wide by 51 1 4 inches long and it should be no thicker than 6 inches.
But what are the dimensions of a crib.
A standard size crib mattress is a baby crib mattress with the following measurements.
Astm f1169 19 specifies performance requirements and test procedures to determine the structural integrity of full size cribs.
To prevent head entrapment and suffocation between the mattress and crib sides a mattress used in a full size crib must be at least 27 1 4 inches x 51 1 4 inches with a thickness not exceeding 6 inches.