γγγγThe graph above shows the head circumference development curve for infants released by the World Health Organization. As can be seen from the graph, the average head circumference growth is 2 cm per month during the first 3 months of life, 1.5 cm per month during the first 4-6 months of life, 1 cm per month during the first 7-9 months of life, and 0.5 cm per month during the first 10-12 months of life. head circumference growth is even slower after the age of 1 year. Therefore, if an infant has an abnormal head circumference such as deviated head (or tilted head), navicular head, short head, etc., it should be corrected as early as possible within 3 months after birth when the head circumference grows the fastest.