Subdivision will not cope

I was creating a character and after I got low poly model done, I was going to subdivide it to make it look smoother, but some edges and vertices wont show up.


What should I do to get the edges to appear?

Only quads and tris get subdivided with edges through them. Polygons with more than 4 vertices only get their edges subdivided.

https://www.youtube.com/watch?v=ZM3HEb2Fwxs

Okay, thanks.