BSF Baby Addison 4-in-1 Convertible Crib in White - 1700050WHT. Uses a standard crib mattress which is not included. Designed for children. Transitional bed includes safety bedrails. Great transitional stage until use of the full-size headboard is needed. Headboard and footboard attach to a standard frame. Footboard attaches to bed with adult rails. Bedrails are sold separately. Converts from a crib to transitional bed (bedrails included) to child's day bed to full-size bed.