is a traditional Japanese rite of passage and festival day for three- and seven-year-old girls, five-year-old and sometimes three-year-old boys, held annually on November 15 to celebrate the growth and well-being of young children. As it is not a national holiday, it is generally observed on the nearest weekend.
Shichi-Go-San is said to have originated in the Heian period amongst court nobles who would celebrate the passage of their children into middle childhood, but it is also suggested that the idea was originated from the Muromachi period due to high infant mortality. The ages 3, 5 and 7 are consistent with East Asian numerology, which holds that odd numbers are lucky. The practice was set to the fifteenth of the month during the Kamakura period.
Its meaning is to celebrate the survival of children, as infant and child mortality rates were higher in previous centuries.
Over time, this tradition passed to the samurai class who added a number of rituals.