Question

use a firm and flat ________ surface in a safety - approved crib. sleeping prep dry i dont know previous next brightcourse kankakee 260 s washington ave, kankakee, il 60901 please call if you have any questions!

Explanation:

The context is about a surface in a crib for a baby - related use. A firm and flat sleeping surface is recommended for safety in a baby crib.

Answer:

sleeping