While browsing I saw this and would like to share to everybody measurement for baby hat. Hopefully it is helpful and as our guideline during crocheting
Newborn: 0 to 3 Months
Head Circumference 13" - 14"
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Baby - 4 to 6 Months
Head Circumference: 14" - 17"
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Baby - 6 to 12 Months
Head Circumference: 16" - 19"
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Toddler -12 Months to 3 Years
Head Circumference: 18" to 20"
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Child - 3 - 10 Years
Head Circumference: 19" - 20 1/2"
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Preteens and Teens
Head Circumference: 20 1/2" - 22 1/2"
Enjoy crocheting...........