The Compendium of Caraka 4.8.32_5

4.8.32_5

ataścaivāsyāstailāt picuṃ yonau praṇayedgarbhasthānamārgasnehanārtham/yadidaṃ karma prathamaṃ māsaṃ samupādāyopadiṣṭamānavamānmāsāttena garbhiṇyā garbhasamaye garbhadhāriṇīkukṣikaṭīpārśvapṛṣṭhaṃ mṛdūbhavati, vātaścānulomaḥ saṃpadyate, mūtrapurīṣe ca prakṛtibhūte sukhena mārgamanupadyate, carmanakhāni ca mārdavamupayānti, balavarṇau copacīyete; putraṃ ceṣṭaṃ saṃpadupetaṃ sukhinaṃ sukhenaiṣā kāle prajāyata iti//

And from this very oil one should introduce a tampon into the vagina to lubricate the pathway of the embryonic seat. By this procedure, prescribed beginning with the first month and up to the ninth month, the pregnant woman's uterus, abdomen, pelvis, flanks, and back become soft at the time of delivery; her vāta moves downward; her urine and feces, becoming normal, pass through their path with ease; her skin and nails attain softness; both strength and complexion increase; and she gives birth with ease, at the proper time, to a desired, healthy son endowed with perfections.