Head circumference

Answer 1

Definition

Head circumference is a measurement of a child's head around its largest area -- it measures the distance from above the eyebrows and ears and around the back of the head.

Alternative Names

Occipital-frontal circumference

Information

During routine check-ups, the distance is measured in centimeters and compared with previous measurements; normal ranges are based on sex and age (weeks, months).

Measurement of the head circumference is an important part of routine well baby care. Through the years, doctors have obtained values for normal growth rates of infants and young children's heads. During the well baby exam, a deviation from the expected normal head growth may alert the doctor of a possible problem.

For example, a head that is larger than normal or whose size is increasing faster than normal may be a sign of increased intracranial pressure, which can be caused by any number or problems including water on the brain (hydrocephalus).

An exceptionally small head size (called microcephaly) or very slow growth rate may be a sign that the brain is not developing properly.

References

Kimmel SR, Ratliff-Schaub K. Growth and development. In: Rakel RE, ed. Textbook of Family Medicine. 7th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 31.

Answer 2

Definition

Head circumference is a measurement of a child's head around its largest area -- it measures the distance from above the eyebrows and ears and around the back of the head.

Alternative Names

Occipital-frontal circumference

Information

During routine check-ups, the distance is measured in centimeters or inches and compared with:

• Past measurements of a child's head circumference
• Normal ranges for a child's sex and age (weeks, months) -- based on values experts have obtained for normal growth rates of infants' and children's heads

Measurement of the head circumference is an important part of routine well baby care. During the well baby exam, a change from the expected normal head growth may alert the doctor of a possible problem.

For example, a head that is larger than normal or that is increasing in size faster than normal may be a sign of several problems, including water on the brain (hydrocephalus).

A very small head size (called microcephaly) or very slow growth rate may be a sign that the brain is not developing properly.

References

Kimmel SR, Ratliff-Schaub K. Growth and development. In: Rakel RE, ed. Textbook of Family Medicine. 7th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 31.

Reviewed By

Review Date: 01/17/2011

Jennifer K. Mannheim, ARNP, Medical Staff, Department of Psychiatry and Behavioral Health, Seattle Children's Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.