Why is a boy worshipped alongside nine girls during Kanya Pujan?

Kanya Pujan is performed on Ashtami, eighth day of Navratri, or on Navami, ninth day. During the ritual, nine young girls are worshipped as representations of nine forms of Goddess Durga. A young boy, often called 'Langoor', is also worshipped and is believed to be a form of 'Bhairav Baba,' a guardian and devotee of the Goddess, Times Now reported.