A member asked:

What is the average head circumference for a 6 month old girl?

A doctor has provided 1 answer

It is just a number: Around 42 cm (16-17 in). The number is somewhat meaningless from a medical standpoint... sort of like hair color. If one asks, "What is the average hair color of a 6 year-old girl", the answer is a meaningless color. Head circumference percentiles are compared to the percentiles of the parent's head sizes. Thus, if the parents have smaller heads, we don't worry about their babies' smaller heads.

Answered 11/8/2018

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