What Is the Typical Size of the Human Head?

Doctors and researchers use head and brain size data to develop new medical advances.

This information regarding the size of the human head is also useful to other professionals worldwide. These include the fashion industry, designers of safety equipment, and eyeglass manufacturers, among others.

The average human head measures 6-7 inches in width and 8-9 inches in length, according to collected data and reports. The average circumference of the human head is between 21 and 23 inches. Multiple factors determine the exact size of each individual’s head. These uncover a portion of them.

Gender

According to research conducted at the Universities of Cambridge and Oxford, men typically have larger heads than women. These studies were conducted on men and women between the ages of 18 and 59. Men tend to have brains that are 8 to 13 percent larger on average than women when comparing individuals of the same age. This led to larger head circumferences.

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Size of the Brain

The overall size of the head is largely determined by the size of the brain. The brain resides within the skull cavity. When a baby is born, the skull is not fully formed or rigid. Localized soft spots covered by tough, fibrous membranes are called fontanels, and they allow the foetal head to pass through the birth canal. The delicate fontanels close as the skull develops to accommodate the growing brain, as larger brains require larger cavities. This has a direct impact on the head circumference at maturity.

Nutrition

When you hear that the food you eat affects your brain development, you should recognise that this is true. The nutrition a person receives during gestation and as an adult can influence the size of their brains.

In various regions of the world, researchers monitored the effects of nutritional values on body and brain development. The findings indicate that pregnant women who consumed healthier diets had babies with normal body and head sizes. In regions with poorer nutrition, smaller babies were born.

Birth Sequence (Multiple Baby Births)

When studying the head circumference of multiple birth babies (such as twins and triplets), scientists discovered that birth order influences head size. While children born first tend to weigh more on average, those born last in multiple births tend to have a larger head circumference. This is due to the space within the uterus and the child’s position. It also demonstrates the effects of prenatal nutrition. The gender of the newborn will also affect the size of the head at birth. This also affects the rate of head growth in the earliest stages of life, with male infants typically experiencing more rapid growth spurts.

Medical Disorders

Numerous medical conditions can affect the size of the human head from birth to death. Among these conditions are:

Microcephaly

Macrocephaly

Disorders of the Skull

The Russell Silver Syndrome

Down syndrome

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