Chester had a flat bit on the side of his head, it was quite bad. We sleep him upside down in his cot so he's on the "good" side when facing us. He now sleeps on his side really so its not such a problem now. He started to get muscle tightening and favoured looking right all the time, but with encouragment, moving toys etc to the other sides thats corrected itself as well.
I didnt realise so many babies suffered with it, I felt terrible about it at first but it can be corrected with a lot of perserverance!