If you assembled your child's Graco Classic convertible crib when you purchased it, you shouldn't have much difficulty converting it to a toddler's bed. The toddler bed/day bed conversion is essentially the Classic crib with the drop-side removed. Unlike the conversion to a full-sized bed, you don't need additional materials or a new mattress, and there is little disassembly. When complete, the bed will take your toddler through preschool age or up to 50 pounds, when he'll be ready for a full bed.
Remove the bedding and mattress from the crib. Set the drop-side as high as it will go.
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Remove the rail stops, or block brakes, from the bottom of each plastic track below the drop-side using a Philips-head screwdriver. The block brakes resemble Philips-head screws with a small plastic cylinder around the top half.
Pull the block brakes out of the plastic rails and set them aside for future use.
Lower the drop-side slowly. When it falls below the area where the block brakes had been, it will come off the rail. Remove the drop-side completely.
Set the mattress stretcher to the lowest position, if necessary. Remove the 3/4-inch bolts that attach the stretcher to the legs with an allen wrench. Align the holes in the metal tabs on the stretcher with the lowest corresponding holes in the legs. Re-insert the bolts and tighten them with the allen wrench.
Replace the mattress and make the bed as desired.