It doesn't matter. The baby's head can be corrected six months ago. After half a year, it will be difficult. My baby will fall asleep. I will take measures in time. My baby can sleep well. You do this: let the baby sleep on a small pillow with millet. You can let him watch you, or you can let him sleep on which side of the baby is convex. You should guide him to play or sleep in that direction. If the child doesn't sleep honestly, you can lift his head under his little pillow and let him go that way.