The brain reaches 1/2 of its adult size by 9 months and nearly 3/4 by the age of two, a baby's head has to be large to accommodate that rapid growth. Their body size gradually catches up with the head and at around age 20 your head reaches adult size in proportion to your body.
These hats are too small around and not deep enough in the crown to sit properly on your head, therefore, they are uncomfortable and do not look very good .Big Hat Size ChartBig Head Size InchesBig Head Size CMBig Hats Size24 5/8 - 24 7/862.3 - 63.27 7/825 - 25 1/463.3 - 64.1825 3/8 - 25 5/864.2 - 65.18 1/8