Why we care about head circumference issues ...

Dr. Dana Johnson's review article on head size - "Does Size Matter, Or Is Bigger Better?" - says it best. Highly recommended for parents considering referrals with head growth concerns. Growth charts are available here.

How to measure a proper head circumference ...

Bring a non-stretchable measuring tape, and practice a bit first. Wrap the tape snugly around the widest possible circumference - from the most prominent part of the forehead (often 1-2 fingers above the eyebrow) around to the widest part of the back of the head. Try to find the widest way around the head. Remeasure it 3 times, and take the largest number.