What is normal head circumference for an 18 month old boy? Head Circumference for Age
In most cases, boys head measurements for this age group (18 month old) will lie within the range between 44.72 and 49.55 cms.
What is normal head circumference at birth? Head circumference. The distance around the baby’s head: The average newborn’s head measures 13 3/4 in (35 cm)
What head circumference is normal?
Girls: Head circumference from 2 to 3 years.
|Age (months)||Average head circumference|
How is head circumference related to age? On average, head circumference increases by 2 cm per month in 0 to 3 months of age and 1 cm/month in 3 to 6 months of age. During the last six months of infancy, head circumference increases by 0.5 cm/month. During the first year of life, there is a 12 cm average increase in head circumference.