A cot bed is a type of bed that is designed to convert from a cot for a baby or toddler into a larger bed for an older child. It is typically larger than a standard cot, but smaller than a twin or full-size bed, making it a versatile option for parents looking to transition their child from a crib to a regular bed. Cot beds often have side rails that can be removed as the child grows, and some also come with storage drawers or under bed storage for added convenience.