4 in 1 Convertible – converts from baby crib (mattress sold separately) to toddler bed (guardrail kit included), day bed, and later full-size bed (full size kit sold separately). Grows With Baby – adjustable mattress support with 3 height options. Fits any standard full-size crib and toddler mattress. Transition when child can climb out or is taller than 35 inches. Safety 1ST – independently tested for Cpsc and Astm Federal Safety standards. Quality Craftsmanship – made with high-quality steel and durable powder-coated finish that withstands years of cleaning.