Attach the right-front post to the slatted right end panel by putting the wooden dowel in the appropriate hole. Secure the two pieces using the 2.5-inch and 3-inch bolts and the Allen key that came with your crib. Repeat for the left-front post and slatted left end panel.
Attach the right-front end panel to the headboard using a wooden dowel. Secure the pieces using the 2.5-inch and 3-inch bolts and an Allen key, and repeat the process for the left-front end panel.
Join the mattress support to the posts using the Allen key and the 1.5-inch bolts. The mattress support should be level and center before you tighten all four bolts on the mattress support.
Use 3-inch bolts and the Allen key to attach the front panel of the crib to the left- and right-front posts.