Welcome to MiaMaries! Thanks for stopping by! When ordering the Set of 2 or 3 - Please specify in the "Notes" when purchasing, which combination you would like. If you choose CUSTOM SIZE please measure your child’s head circumference to the nearest half inch then write that in the “Note to Seller” section when ordering. (The custom size could be for adults too! Just include your head size in the “note to seller” section!) CUSTOM ORDERS ARE AVAILABLE if you would like to combine styles or different patterns. Please contact me! SIZES: Newborn - 14" Circumference Baby- 16" Circumference Toddler- 18" Circumference Child -20" Circumference ***Please note these are average sizes for age groups, please measure your child’s head before ordering to ensure perfect fit*** **Also, never leave child in crib with headbands on, always supervise child when headbands are being worn.***