Toddler Conversion Kit-(tot rail, stabilizer bar, and hardware to convert your crib into a toddler bed, and a day bed) You will want to use your crib as a tot bed and as a daybed in its lowest mattress position as your toddler learns to come and go when they wake. Make sure you keep your crib's instruction manual to ensure that the guardrail is assembled correctly and the rail you have is 100% compatible with your crib.