Newborn 13-14"
0-3 months 14-15"
3-6 months 15-17"
6-12 months 16-19"
Toddler 1-4 years old 18-21"
Child: 4+ years old 19-22"
Adult: 21-24"
*NOTE: to determine appropriate sizing, please measure head circumference using a tape measure. All sizes are approximate and Monster Mom Crafts is not responsible for hats that do not fit due incorrect measurement. To ensure a proper fit, please measure the intended hat-wearer carefully. Should a sizing error occur, please contact me at [email protected]