We had some leftover, already painted boards that Jack cut to size. The two sideboards were attached with two screws to the top cross board. The top board was able to rest on top of the crib, then two smaller boards were attached behind the sideboards to make it easier to attach to the crib. We used two heavy-duty zip ties on each side to secure to the crib.
This quick project helps keep Andrew stay safely in his crib and I don’t have to worry about him climbing out and getting into something while we sleep.