Mahabharata 3.188.48

पञ्चमे वाथ षष्ठे वा वर्षे कन्या प्रसूयतेसप्तवर्षाष्टवर्षाश्च प्रजास्यन्ति नरास्तदा

pañcame vātha ṣaṣṭhe vā varṣe kanyā prasūyatesaptavarṣāṣṭavarṣāśca prajāsyanti narāstadā

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