A baby crib is an infant bed. It is often referred to as a cot in British English. Generally, these are used for children up to around the age of three. There are quite a few different groups which may be even further classified according to age. For instance, a bassinet is used for children under about four months while toddler beds are designed for children leaving the stage of infancy.
A true baby crib bed will be used when it is no longer safe to leave the child in a bassinet. Cribs are designed to be more stable than bassinettes. They have a broader base of support and a lower center of gravity.
The emphasis of a baby crib is placed upon restricting the baby to the bed. This is accomplished by having sides which are too high for the baby to climb. These high sides also work to provide no footholds. In addition to restraining the child from a fall, these designs also encourage a woken child to go back to sleep rather than to roam around the home.