Newborn to 3 month old.
Measures 12 1/2 inches (32 cm) around and 6 inches (12 cm) from the rolled up rim to the top of the hat. It will easily stretch another 1 inch around and the rim can be unrolled which would also add an inch to the height of the hat.
Hand or machine wash with a mild detergent in lukewarm water. Air dry.