Kitasaga

...It is found in both the Okura and Izumi schools. In the Okura school, it is called "Nanatsu ni Naruko," and in the Izumi school, it is also called "Kita Saga" or "Ochamenoto," an ancient name. It is a song based on the words used by wet nurses to soothe young children.

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…大蔵，和泉両流にある。大蔵流では《七つに成子（なるこ）》と称し，和泉流では古名を《北嵯峨》《おちゃめのと》ともいう。乳母が幼な児をあやすことばを歌謡化したもの。…

※「《北嵯峨》」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