Using two strands of WW #4 held together throughout:
Ch 41 (1 turning ch, 33 hdc, 7 sc) = 13” length
Row 1: hdc in 2nd ch from hook, and next 32 chains (I do this in the back bump). SC in remaining 7 chains.
Following rows are crocheting into BLO.
Row 2: ch 1, turn. SC in first 7 sc’s, hdc in ea hdc from previous row.
Row 3: ch 1, turn. 33 hdc, 7 sc
REPEAT ROW 2 AND 3, ENDING AFTER A ROW 2.
I think I have 46 (maybe 48?) rows, and this hat will fit “Teen / Adult”.