The BSF Baby Addison 4-in-1 Crib in Espresso contains a stylish wood design and a 3-position mattress support system. The Addison uses a standard crib mattress which is not included. The transitional bed is designed for children who have outgrown their crib, but still require the included safety bedrails. The childs day bed is a great transitional stage until use of the full-size headboard is needed. The headboard attaches to a standard frame to create a full size bed. Assembed Dimensions (in inches): 57.75 x 30.75 x 43.5