Bṛhadāraṇyaka Upaniṣad 6.4.24

When the child is born, he prepares the fire, places the child on his lap, and having poured prishadagya, i.e. dadhi (thick milk) mixed with ghrita (clarified butter) into a metal jug, he sacrifices bit by bit of that prishadagya, saying: `May I, as I increase in this my house, nourish a thousand! May fortune never fail in his race, with offspring and cattle, Svaha!' `I offer to thee in my mind the vital breaths which are in me, Svaha!' `Whatever in my work I have done too much, or whatever I have here done too little, may the wise Agni Svishtakrit make this right and proper for us, Svaha!'