Headband Sizing:
Preemie - 12"
Newborn - 13"
0-3 Months - 14"
3-6 Months - 15"
6-12 Months - 16"
12 Months and up -17"
Adult - 18"
All sizes are an average and if you would like a perfect fit, please measure around the head and subtract 1" from the measurement. If you would like a custom measurement, just leave the size in the order comments. You can also choose an alligator clip if you do not want a headband.