1509.9—Mattresses.
(a) Mattress thickness.
(1)
A mattress supplied with a non-full-size crib shall, in a noncompressed state, have a thickness that will provide a minimum effective crib-side height dimension of at least 50.8 centimeters (20 inches) as measured from the upper surface of the crib side and/or end panel. For this measurement, the crib side shall be in its highest adjustable position and the mattress support in its lowest adjustable position.
(2)
A mattress supplied with a non-full-size crib shall, in a noncompressed state, have a thickness that will provide a minimum effective crib-side height dimension of at least 7.6 centimeters (3 inches) as measured from the upper surface of the mattress to the upper surface of the crib side and/or end panel. For this measurement, the crib side shall be in its lowest adjustable position and the mattress support in its highest adjustable position.
(b) Mattress dimensions.
The dimensions of a mattress supplied with a non-full-size baby crib shall be such that the mattress, when inserted in the center of the crib, in a noncompressed state at any of the adjustable positions of the mattress support, shall not leave a gap of more than 1.3 centimeters ( 1/2 inch) at any point between the perimeter of the mattress and the perimeter of the crib. When the mattress is placed against the perimeter of the crib the resulting gap shall not exceed 2.6 centimeters (1 inch).