Head circumference is related to genetics and neurological disorders, etc. Generally speaking, the head circumference of 7-year-old children is 55 centimeters is within the normal range. The head circumference of 5-year-old children is about 50 centimeters, with the increase of age, the growth rate of head circumference is also gradually slowed down, at the age of 15 years old close to the adult head circumference of 54~58 centimeters, the head circumference of 7-year-old children 55 centimeters is within the normal range. Head circumference is related to heredity and neurological disorders, etc. Children’s head circumference is similar to that of their parents because of hereditary factors. In addition, neurological disorders such as hydrocephalus may lead to increased head circumference. Seven-year-old children can also be measured by height, weight, chest circumference, upper arm circumference, subcutaneous fat and other measurements to comprehensively determine the child’s growth and development, timely detection of problems in the child’s growth and development process, and timely intervention. If the child’s growth rate is normal and not accompanied by other discomforts, the head circumference belongs to the normal range. If you find any abnormalities or discomfort in your child’s growth and development, you should go to the hospital for timely intervention and treatment.