It appears to have taken hold in Nepal in the 6th century.
There is written evidence describing the selection, ornamentation and worship of the Kumari dating from the 13th century CE.
A Kumari is believed to be the incarnation of Taleju.
When her first menstruation begins, it is believed that the goddess vacates her body.
As the supreme goddess is thought to have manifested this entire cosmos out of her womb, she exists equally in animate as well as inanimate objects.
While worship of an idol represents the worship and recognition of supreme through inanimate materials, worship of a human represents veneration and recognition of the same supreme in conscious beings.
In the Shakta text Devi Mahatmyam or Chandi, the goddess is said to have declared that she resides in all female living beings in this universe.
The word Kumari is derived from the Sanskrit Kaumarya, meaning "princess".The main target of a Kumari puja is to realize the potential divinity in every human being, mostly female.A Hindu spiritual aspirant sees the universal consciousness of humanity.But one night the king's wife followed him to his chamber in order to find out who the king was meeting so often.The king's wife saw Taleju and the goddess was angered.In Nepal, Kumaris are worshiped only for a day; these names are assigned only while the ritual lasts, often a few hours.