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.
How big should a baby’s head be at 4 months?
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 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.
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.
What is considered a big head?
What is considered a big head? Is a size 8 hat big? The average size male head is 22″ 1/2 and the average size woman head is 21″ 3/4. … In the hat world, head sizes over 23″ 3/8 would be considered a big head.
Are big head babies smarter?
The study found that babies with a head circumference of 12.5 inches to 14 inches were more likely to be smarter when they grew up. Intelligence later in life was shown by achievements such as earning a college degree or scoring higher on verbal or numerical reasoning tests.
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.