Infant mattress that fits safely in a crib

A crib assembly, comprising:

• a crib with a horizontal mattress platform and vertical bars positioned peripherally around the mattress platform;
• and
• a mattress resting on the mattress platform, wherein the mattress has a top surface and a bottom surface, a first foam layer and a ring of visco-elastic foam, wherein the first foam layer has four side surfaces, wherein no layer of foam is disposed above the first foam layer, wherein the ring of visco-elastic foam abuts the four side surfaces of the first foam layer, wherein the ring of visco-elastic foam has an uncompressed width of at least one inch and extends in a vertical dimension from the top surface of the mattress to at least the bottom surface of the mattress, wherein the ring of visco-elastic foam does not extend above the top surface of the mattress, wherein the width of the ring of visco-elastic foam is compressed by the vertical bars, and wherein the ring of visco-elastic foam is a single piece of molded foam.

A crib assembly, comprising:

• a crib with a horizontal mattress platform and vertical bars positioned peripherally around the mattress platform;
• and
• a mattress resting on the mattress platform, wherein the mattress includes a first foam layer and a ring of visco-elastic foam, wherein the first foam layer has a bottom surface, a top surface and four side surfaces, wherein the ring of visco-elastic foam abuts the four side surfaces of the first foam layer, wherein the ring of visco-elastic foam has an uncompressed width of at least one inch and extends in a vertical dimension from the top surface of the first foam layer to at least the bottom surface, wherein the ring of visco-elastic foam does not extend above the top surface of the first foam layer, wherein the width of the ring of visco-elastic foam is compressed by the vertical bars, wherein the mattress has a width, and wherein the width of the mattress is compressed between the vertical bars on one side of the mattress platform and the vertical bars on an opposing side of the mattress platform.

A method comprising:

• placing a mattress on a platform of a crib having vertical bars positioned peripherally around the platform, wherein the mattress has a top surface and a bottom surface, a first foam layer and a ring of visco-elastic foam, wherein the first foam layer has four side surfaces, wherein no layer of foam is disposed above the first foam layer, wherein the ring of visco-elastic foam abuts the four side surfaces of the first foam layer, wherein the ring of visco-elastic foam has a width of at least one inch and extends in a vertical dimension from the top surface of the mattress to at least the bottom surface of the mattress, wherein the ring of visco-elastic foam is a single piece of molded foam and does not extend above the top surface of the mattress, and wherein the width of the ring of visco-elastic foam is compressed by the vertical bars when the mattress is placed on the platform.

A method comprising:

• placing a mattress on a platform of a crib having vertical bars positioned peripherally around the platform, wherein the mattress has a first foam layer and a ring of visco-elastic foam, wherein the first foam layer has a bottom surface, a top surface and four side surfaces, wherein the ring of visco-elastic foam abuts the four side surfaces of the first foam layer, wherein the ring of visco-elastic foam has a width of at least one inch and extends in a vertical dimension from the top surface of the first foam layer to at least the bottom surface of the first foam layer, wherein the ring of visco-elastic foam does not extend above the top surface of the first foam layer, and wherein the width of the ring of visco-elastic foam is compressed by the vertical bars when the mattress is placed on the platform, wherein the mattress has a width, and wherein the width of the mattress is compressed between the vertical bars on one side of the platform and the vertical bars on an opposing side of the platform.