Technically, your childs head circumference (measurement around the widest part of their head) is greater than the 97th percentile. This means their head is larger than 97% of children of the same age and sex. Macrocephaly can be a sign of a condition that requires treatment.
What is the normal head circumference for adults?
Average Head Circumference by Age At birth, most full-term newborns have a head circumference of about 34 to 35 cm. By 1 month, this typically increases to around 36.5 to 37 cm. At 3 months, many babies will measure about 39 to 41 cm, and by 6 months, the range often lands between 42 and 43.5 cm.
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