As unique conventions, there are customs in some regions in Fukuoka Prefecture to conduct 'Himotoki (the ceremony of fitting an ordinary obi to a child)' of children of 4 to 5 years old, 'Hekokaki (the ceremony of fitting a loincloth to a boy)' and 'Yumojikaki (the ceremony of fitting a Japanese petticoat to a girl)' of 7 years old, all of which are similar to the ritual of coming of age day by wearing adult form of underwear such as fundoshi (a loincloth) or yumoji (a petticoat) for the first time.
変った所では福岡県で4～5歳で「ひもとき」、7歳で「へこかき」（少年）／「ゆもじかき」（少女）（いずれもふんどしや湯文字といった成人仕様の下着を初めて身につける）を行う地区がある。