The Compendium of Bheḷa 4.5.4

4.5.4

iha khalu triṣu daśarātreṣu pumān rasena saṃyujyate | āsāṃ tu khalu catasṛṇāṃ yonīnāṃ ṛtukāle yadā rasāḥ samyak prāptiṃ vā gacchanti tadā garbhaḥtiṣṭhaty[tiṣṭe] avikṛtaḥ viparyaye viparyayaḥ ||

Here indeed, in thirty nights a man is united with chyle. Moreover, in these four wombs, when the chyles attain proper acquisition at the fertile period, then the fetus remains free from defect; in the opposite case, the opposite occurs.