# What is normal head circumference for a 4 month old?

Your baby will experience rapid head growth, particularly during the first four months, and by the end of the first year, her head circumference will be about 18 inches.

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).

Beside above, what is the normal head circumference for a 9 month old? By his first birthday, the average child has tripled his birth weight and is 28 to 32 inches (71 to 81 cm) tall. Head growth between eight and twelve months slows down a bit from the first six months. Typical head size at eight months is 17 1⁄2 inches (44.5 cm) in circumference; by one year, it’s 18 inches (46 cm).

Just so, how much does the head circumference increase per month from 4 to 6 months of age?

From birth to 3 months of age the average increase in your baby’s head circumference is usually 2 cm or . 78 inches each month. From 4 to 6 months of age, the head circumference or head growth slows to about 1 cm per month.

What is the normal head circumference for a 3 month old?

The average total head circumference growth from birth to 3 months is equal to 5 cm (1.97 in.), and 4 cm (1.57 in.) average from 3 to 6 months.

### 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) 50th Percentile Head Circumference (in centimeters) 0 31.48762 35.81367 0.5 33.25006 37.19361 1.5 35.78126 39.20743 2.5 37.5588 40.65233

### What is the average head circumference?

Adult Woman Man Circumference (in.) 21–23 22–24 (cm.) 53–58.5 56–61

### Why is my baby’s head big?

Macrocephaly is the term for an unusually large head. An infant with macrocephaly will have a larger head than most other infants of the same age and sex. In many cases, this condition is benign or harmless. In other cases, it may indicate an underlying medical condition, such as a genetic syndrome or a brain tumor.

### Is head circumference related to intelligence?

Preliminary studies have suggested links between brain size, head size, and IQ, but head circumference isn’t directly correlated with intellect. Parents want their newborns to have big heads — not so much at birth, but shortly thereafter. A big head baby implies intelligence, growth, and good genes.

### What causes small heads in babies?

Microcephaly is a condition where the head (circumference) is smaller than normal. Microcephaly may be caused by genetic abnormalities or by drugs, alcohol, certain viruses, and toxins that are exposed to the fetus during pregnancy and damage the developing brain tissue.

### Is small head circumference normal?

Microcephaly is defined as a head circumference measurement that is smaller than a certain value for babies of the same age and sex. This measurement value for microcephaly is usually more than 2 standard deviations (SDs) below the average. The measurement value also may be designated as less than the 3rd percentile.

### Is baby head size important?

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.

### Does a small head always mean microcephaly?

Microcephaly is a condition where a baby’s head is much smaller than normal. It is most often present at birth (congenital). Some children with small heads have normal intelligence. Microcephaly may be caused by problems during a woman’s pregnancy.

### At what age does chest circumference equal head circumference?

1–4 months. Head and chest circumference are nearly equal to the part of the abdomen. Head circumference increases approximately 2 cm (0.79 in) per month until two months, then increases 1.5 cm (0.59 in) per month until four months. Increases are an important indication of continued brain growth.

### What is the average head size of a 6 month old baby?

His or her head will grow ¼ inch per month between 6 months and 1 year of age. His or her head should measure close to 17 inches around by the time he or she is 6 months old and 20 inches by 1 year of age.

### At what age does baby weight gain slow down?

It is very normal for an exclusively breastfed baby’s weight gain to slow down at 3-4 months. The World Health Organization child growth standards, based on healthy breastfed babies, help demonstrate this.

### Do all babies have big heads?

Most babies have big heads. At least, large in proportion to their bodies. But some babies have heads a little bigger than others.

### What does large head circumference indicate?

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.

### How accurate is head circumference ultrasound?

OBJECTIVES: To assess the accuracy of sonographic estimation of fetal head circumference (HC). Overall, sonographic HC measurements consistently underestimated actual HC measured postnatally (mean simple error, – 13.6 mm; 95% CI, – 13.2 to – 13.9), and the difference increased with gestational age.