In some regions, people are thankful that 3 year olds are given language, 5 year olds wisdom, and 7 year olds teeth by God(s), and in other regions, people regard 3, 5, and 7 years as critical times of life and Shichi-go-san takes place as a kind of ritual of warding off evil fortunes.
また、三歳＝言葉、五歳＝知恵、七歳＝歯を神から授かる事を感謝とする地方や、三歳、五歳、七歳は子供の厄として、七五三を一種の厄祓としている地方もある。