The present invention discloses an improved multi-purpose convertible bed assembly. The bed assembly main components include a head board, foot board, a first side panel, a second side panel, and a mattress support frame. The mattress support frame comprises a first bed frame and a second bed frame of substantially the same size and shape. A single bed frame supports a mini-size crib. The first and second frame can be interconnected into a rectangular structure to support a full size crib. The head board and footboard have substantially the same size and shape. Each foot board and head board are supported by a pair of adjustable leg members. Additionally, a telescopically L-shape bracket member is mounted into the top side of each foot board and head board. The first side panel and second side panel have substantially the same size and shape. Each side panel further includes a first section and a second section which are interconnected utilizing an adjustable sliding mechanism which allows the user to adjust the length of the bed between a full size crib and a mini-size crib. The main components of the bed assembly can be assembled and converted into various configurations including a mini-crib, a full-size crib, a sofa crib, bedside crib, day bed, toddler bed, and security gates.