My 4 month plus old LO head shape look uneven. One side flatter and smaller then other side due to he sleep on one side. Whenever I try to turn him opposite, he will harden his muscle especially neck muscle. He seldom do tummy time and he born preemie. I scared his brain not growing and he will grew up with that shape. What should I do to help him get even shape head and not flat too#advicepls #1stimemom ?