|(a) Each crib or play yard (also known as a play pen),
whether provided by the home or the child's parent, must have a firm,
flat mattress that the manufacturer designed specifically for the
crib or play yard model number that snugly fits the sides of the crib
or play yard. You may not supplement the mattress with additional
foam material or pads.
(b) Each crib or play yard must be bare for an infant
younger than 12 months of age, except for a tight-fitting sheet and
a mattress cover to protect against wetness. The mattress cover, whether
provided by the home or the parent, must:
(1) Be designed specifically for the size and type
of crib and crib mattress that the cover is being used with;
(2) Be tight fitting and thin; and
(3) Not be designed to make the sleep surface softer.