Newborn
Head Circumference 13" - 14 "
Baby - 3 to 6 months
Head Circumference: 14" - 17 "
Baby 6 to 12 months
Head Circumference: 16" - 19 "
Toddler - preschooler (12 months - 3 years)
Head Circumference: 18" to 20 "
Child (3 - 10 years)
Head Circumference: 19" - 20 1/2"
Pre-teens and Teens
Head Circumference: 20 1/2" - 22"
Adult Woman
Head Circumference: 21.5" - 22.5"
