The Compendium of Caraka 4.8.40_1

4.8.40_1

yathā hi kṣavathūdgāravātamūtrapurīṣavegān prayatamāno 'apyaprāptakālānna labhate kṛcchreṇa vā 'apyavāpnoti, tathā 'anāgatakālaṃ garbhamapi pravāhamāṇā; yathā caiṣāmeva kṣavathvādīnāṃ sandhāraṇamupaghātāyopapadyate, tathā prāptakālasya garbhasyāpravāhaṇamiti/sā yathānirdeśaṃ kuruṣveti vaktavyā syāt/

For just as one who strives [to evacuate] the urges of sneezing, eructation, flatus, urine, and feces before their time does not attain them or attains them with difficulty, so it is with one bearing down on an unready fetus; and just as the suppression of these very [urges], such as sneezing, leads to harm, so does failing to bear down for a fetus whose time has arrived. She should be told: 'Act according to instruction.'