Flatter right head

My LO has preference to look right when he sleeps, he is 6w old and now his head is flatter on the right side. He has been sleeping in a cocoonababy, which seems to be working as he sleeps longer. Tried to slightly block him from turning right with adding padding under his sheet , but he doesn’t seem to settle to bed when i tried to do so. Should i be worried for a long term effect? Any advice? All i did now is to turn his cot around so facing us on his left.