An infant's bed is a piece of furniture used to provide a safe and comfortable sleeping environment for a baby. The three most common types of infant beds are cribs, cradles, and cots. Cribs are the most popular type of infant bed, typically made of wood and featuring four sides with slats or bars. Cradles are smaller than cribs and often have a rocking motion to help soothe a baby. Cots are similar to cribs but are usually made of metal and have a folding frame.