A bassinet is used on a much more short-term basis than a crib. They are smaller and infants grow out of them by the time they reach about 4 months old. Bassinets are usually oval-shaped, have mesh sides, and are designed for mobility. A crib is a safe option for keeping older babies in their bed at night. They are larger and sturdier than a bassinet, so they are designed to be stationary in a baby nursery. Cribs work for children from early infancy until they are about 2 years of age or so.