After 2.5 frustrating hours of trying to make the crib work, we had to just accept that the manufacturer messed up aligning the holes on one of the lower ledges so that it just would not work.  Extremely frustrating as a pregnant person to put together a crib, disassemble and reassemble it multiple times thinking it MUST be our fault, only to realize it was the manufacturers fault for having the holes in the wrong place. If one piece is messed up, the whole thing doesn't work.