# You asked: How do you measure the circumference of a baby’s head?

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Wrap a flexible measuring tape around his head just above his eyebrows and ears, and around the back where his head slopes up prominently from his neck. The goal is to measure his head at the spot where it has the largest circumference.

## How do you measure head circumference?

The relationship between length and head circumference can be expressed by the simplified formula: head circumference (centimeters) = 0.5 length +9.5 +/- 2.5; head circumference (inches) = 0.5 length + 3.75 +/- 1. This formula is accurate for 95% of measurements in the first 400 days of life.

## What is a normal baby head circumference?

The average newborn’s head circumference measures about 13 3⁄4 inches (35 cm), growing to about 15 inches (38 cm) by one month.

## What is a normal head circumference?

According to Wikipedia, one study in the United States shows, the average adult head circumference to be 55cm (21 3⁄4 ) in females and 57cm (22 1⁄2 in) in males. Another study conducted in UK shows a slightly different result: with the average female head size being 55.2 cm and the average male head size being 57.2 cm.

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Macrocephaly means big head, and it is the name for a condition in which an infant or child has an abnormally large head size. For a doctor to diagnose macrocephaly, the measurement of the head around its widest part needs to be larger than the 98th percentile.

## Why do doctors measure babies heads?

Measuring head circumference helps doctors track the brain’s growth as the skull bones fuse together. It’s normal for a baby’s head size to seem disproportionate to her height and weight. The usual explanation is genetics: If a baby’s parents have big heads, the baby will probably have one too.

## What if head circumference is small?

What is microcephaly? Microcephaly is a medical condition in which the circumference of the head is smaller than normal because the brain has not developed properly or has stopped growing. Microcephaly can be present at birth or it may develop in the first few years of life.

## What happens if a baby’s head circumference is small?

Chances are your doctor will detect microcephaly at the baby’s birth or at a regular well-baby checkup. However, if you think your baby’s head is smaller than normal or isn’t growing as it should, talk to your doctor.

## What is a large head circumference?

Macrocephaly refers to an overly large head. It’s often a symptom of complications or conditions in the brain. There’s a standard used to define macrocephaly: The circumference of a person’s head is more than two standard deviations above average for their age. Or, their head is larger than the 98th percentile.

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## What does baby head size indicate?

Another measure of infant growth is head circumference, or the size of your baby’s head. It’s important because it can indicate how well their brain is growing. If your baby’s brain isn’t growing properly, they may have a condition known as microcephaly.

## Does baby head size determine intelligence?

The children took IQ tests when they were 4 years old and 8 years old. Those with the biggest heads tended to have the highest IQ scores. The researchers found that head growth by age 1 was the key factor. Catch-up growth didn’t matter as much.

## What does head size indicate?

He says measuring the size of the head does give some indication of how big the brain is. Hurlburt: Even though head size also depends on factors such as the muscularity of the head and thickness of the bone, it’s very likely that a bigger head means a bigger brain.