Mahabharata 1.68.3

जातकर्मादिसंस्कारं कण्वः पुण्यकृतां वरःतस्याथ कारयामास वर्धमानस्य धीमतः

jātakarmādisaṃskāraṃ kaṇvaḥ puṇyakṛtāṃ varaḥtasyātha kārayāmāsa vardhamānasya dhīmataḥ

Our plain-language meaning of this verse is waiting for scholar review.