Hi,
My youngest son slept with his head tilted to the side a bit, and his head ended up VERY lopsided. My GP told me to take him to a paediatrician, which we did because it was actually affecting the symmetry of his face. One ear looked like it stuck out and one eye looked a bit bigger than the other one. The paediatrician said just to keep turning his head the other way. As soon as he started sitting, it started getting better. He is 2 and I still dont think his head is perfectly round, but its nothing noticable now, thank God.