# What is the average baby head size at birth?

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The average newborn’s head circumference measures about 13 3⁄4 inches (35 cm), growing to about 15 inches (38 cm) by one month. Because boys tend to be slightly larger than girls, their heads are larger, though the average difference is less than 1⁄2 inch (1 cm).

## What is the normal head circumference of a child?

To convert inches to centimeters: 1 in = 2.54 cm. Head circumference. The distance around the baby’s head: The average newborn’s head measures 13 3/4 in (35 cm)

## What is considered a big head for a baby?

The average newborn’s head measures 13 3/4 in (35 cm) Generally, a newborn’s head is about half the baby’s body length in cm plus 10 cm. So a baby that is 18 inches long would be 45.7 centimeters (18 x 2.54). His or her head would be about 32.9 cm or a little under 13 inches.

## Is 32 cm head circumference at birth?

Measurement of the head circumference is a routine yet critical part of newborn, infant, and toddler health supervision care. Abnormal head growth may indicate a medical or developmental problem and often leads practitioners to further evaluation. Normal head circumferences in term infants range from 32 to 38 cm.

If your baby’s head is measuring small or is not growing: Your baby’s doctor may be concerned about failure to thrive (when a child doesn’t take in enough calories or is unable to utilize them and doesn’t grow properly as a result).

## What is abnormal 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.

## Does baby head size determine intelligence?

Preliminary studies have suggested links between brain size, head size, and IQ, but head circumference isn’t directly correlated with intellect. Among the many things that expectant parents hope for in a newborn is, a big head — maybe not so much at birth, but shortly thereafter.

## What is considered a big head?

The average size male head is 22″ 1/2 and the average size woman head is 21″ 3/4. The one size fits all (OSFA) hats stop at about 23″, so a person would find it difficult finding a hat that fits around a size 7 1/2 and above. In the hat world, head sizes over 23″ 3/8 would be considered a big head.

## 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.

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## Do autistic babies have large heads?

He points to a 2015 review of more than 8,000 people, which concluded that head size is larger in autistic people than in their typical peers3. What about girls on the spectrum? Multiple studies have suggested that large brains are much rarer among girls with autism than among boys with the condition.

## Why do some babies have small heads?

Microcephaly is a condition where a baby’s head is much smaller than expected. During pregnancy, a baby’s head grows because the baby’s brain grows. Microcephaly can occur because a baby’s brain has not developed properly during pregnancy or has stopped growing after birth, which results in a smaller head size.

## Is 34 cm head circumference at birth?

Your baby’s head will grow at its fastest rate during the first 4 months after birth than at any other time. This increase is due to rapid brain growth. The average head circumference at birth is about 34 cm (13.5 in.).

## What is the normal percentile for head circumference?

Data Table of Infant Head Circumference-for-age Charts

Age (in months) 3rd Percentile Head Circumference (in centimeters) 10th Percentile Head Circumference (in centimeters)
0.5 33.25006 34.67253
1.5 35.78126 36.97377
2.5 37.5588 38.60724
3.5 38.89944 39.85123

## Should I worry if my baby has a small head?

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.

## Can babies have small heads normal?

Microcephaly is a condition where a baby’s head is much smaller than normal. It is most often present at birth (congenital). Most children with microcephaly also have a small brain and intellectual disability. Some children with small heads have normal intelligence.

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## Will my baby’s head round out on its own?

In most cases, your baby’s head shape will resolve on its own. Given time and a little effort, your baby’s head will grow and return to normal as they begin moving and doing more. Wearing a helmet is also a good way to correct large malformation or flat spots on your baby’s head.