Head circumference is an important measurement in pediatrics as it provides valuable information about the growth and development of a child's brain and skull. To measure head circumference, use a non-stretchable measuring tape. Wrap it securely around the widest part of the head, including the forehead above the eyebrow, above the ears, and the back of the head. Take three measurements and choose the largest to the nearest 0.1 cm. Measure on the first day of life, as reference charts are based on measurements taken before 24 hours of age