In the Vedas(four Vedas- Rigved, Yajurved, Samved,
and Atharvaved) there is only one mantra‘Om' for recitation.
Its evidence is also present in Holy Rigved, Mandal 10, Sukta 90, and Mantra 16.
Even in the following mantras of the Holy Rigved, the characteristics have been given that when
that Supreme God comes to this world for some time to perform a divine act, He acquires the form of a child.