Mahabharata 6.13.12
औद्भिदं प्रथमं वर्षं द्वितीयं वेणुमण्डलम्तृतीयं वै रथाकारं चतुर्थं पालनं स्मृतम्
audbhidaṃ prathamaṃ varṣaṃ dvitīyaṃ veṇumaṇḍalamtṛtīyaṃ vai rathākāraṃ caturthaṃ pālanaṃ smṛtam
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book