The Compendium of Kāśyapa 3.7.3

3.7.3

jātau jātau khalu svabhāva evākṛtibhedanirvartayitā bhavati | svabhāvato hyasya vāyuparamāṇavaḥ saṃyogavibhāgaceṣṭādhikārā ākuñcanaprasāraṇakoṣṭhāṅgapratyaṅgadhātucetanāsrotāṃsi vibhajānta | samatyake dhāturiva niṣiktaḥ puruṣaḥ puruṣamabhinirvartayati gaurgāmaśvā'śvamevamādi
nṛṇāmapi tu madhye garbhanirvṛttiḥ | tatra dvayordampatyoḥ svabhāvāt svakarmapariṇāmādvā prajābhivṛddhirbhavati tau dhanyau ato'nyathā bhiṣajitavyau
snehasvedavamanavirecanāsthāpanānuvāsanaiḥ kramaśa upacarenmadhurauṣadhasiddhābhyāṃ kṣīraghṛtapuṣṭaṃ puruṣaṃ striyaṃ tu tailamāṃsābhyāmityeke sātmyaireveti prajāpatiḥ

In each and every species, nature alone is the producer of diversity in form. For by nature, the minute particles of wind, which are responsible for conjunction, disjunction, and motion, divide contraction, expansion, the visceral organs, the minor limbs, bodily tissues, consciousness, and the microchannels. When properly placed, just as bodily tissue is deposited, a man brings forth a man, a cow a cow, a horse a horse, and so forth. / And among human beings, too, the formation of the embryo takes place. There, if the increase of offspring occurs for both spouses through nature or through the ripening of their own past actions, they are fortunate; otherwise, they are to be treated by a physician. / One should treat them progressively with unction, sudation, emesis, purgation, decoction enemas, and unctuous enemas; the man should be nourished with milk and medicated ghee prepared with sweet herbs, and the woman with sesame oil and meat—so say some; 'only with what is adaptively wholesome,' says Prajāpati.