Kamiyoke - Guardian

...A ceremony in which three-year-old boys and girls stop shaving their hair and start growing it out. It is also called Kamitare, Kamiyoke, Kamitate, etc. The Kamioki ceremony was held from the Kamakura period to the Muromachi and Edo periods, and was often held on November 15th when the child was two years old for nobles and three years old for samurai families.

*Some of the terminology explanations that mention "Kamiyoke" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…男女の3歳児に，それまで髪をそっていたのをやめて，のばしはじめる儀礼。カミタレ，カミヨケ，カミタテなどともいう。髪置の儀は，鎌倉時代から室町，江戸時代まで行われ，公家では2歳，武家では3歳の11月15日に多くは行われた。…

※「カミヨケ」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報