On topic: mis-shapen heads will even out and become normal usually by the first year. Our friend's two baby boys both had this for months - well past 6. Her second in fact really really pronounced, primarily from not rotating when sleeping early on. His head was totally flat on the back toward one side. He's about 2 years old now and you'd never know he ever had such an issue.

I'm sure the doctor will tell you it's going to be fine.