Mount the rear side's post to the post of the headboard and footboard. Fasten to the posts, using the bolts provided with the crib, but do not fully tighten the bolts.
Install the mattress support -- i.e., springs -- to the the headboard and footboard at the appropriate height, using the bolts and wing nuts provided. The highest position should be used for newborns, while the lowest position is more appropriate for a baby who is able to kneel or stand in the crib.
Mount the front side's posts to the headboard and footboard. Fasten to the posts, using the bolts provided with the crib, but do not fully tighten the bolts.
Use the Allen wrench to fully tighten all bolts on the crib.
Place crib mattress on top of the support springs.