Shiva Purana
जातं ध्यात्वैवमाकारं जातकर्म समाचरेत् ॥ नालापनयनं कृत्वा ततः संशोध्य सूतकम् ॥ ४६ ॥
One should meditate on the birth in this form and perform the birth rituals. After removing the drain and then repairing the thread.
english translation
jAtaM dhyAtvaivamAkAraM jAtakarma samAcaret ॥ nAlApanayanaM kRtvA tataH saMzodhya sUtakam ॥ 46 ॥
hk transliteration by Sanscript