Shiva Purana
तत्रादौ शान्त्यतीतां तु व्यापिकां स्वाध्वनः कलाम् ॥ शुद्धामेव शिशोर्मूर्ध्नि न्यसेच्छान्तिमुखे तथा ॥ ५० ॥
In the beginning of the universe there is a pervasive transcendental period of peace called Svadhvana Kala Place the pure one on the head of the child and on the face of peace.
english translation
tatrAdau zAntyatItAM tu vyApikAM svAdhvanaH kalAm ॥ zuddhAmeva zizormUrdhni nyasecchAntimukhe tathA ॥ 50 ॥
hk transliteration by Sanscript