Hello. 18 years old, the deviation cannot be corrected by adjusting the sleeping position. Before the baby is half a year old, the deviation of skull sleep can be adjusted by sleeping position. After half a year's correction, there can be slight changes, but it is not obvious. In the United States, correcting the baby's head shape is set before half a year old. After half a year, the correction result is not ideal, and no correction will be accepted. As long as the hair is longer, it can cover the head shape. Don't worry too much. Many people can't sleep well, so they do what they have to do, right?