The Compendium of Caraka 4.8.40

4.8.40

And those women possessing the aforementioned qualities should instruct her: 'Do not bear down in the absence of labor pains; for she who bears down in the absence of labor pains—her effort becomes entirely futile, and her offspring becomes impaired, suffers deformity, or becomes afflicted with dyspnea, cough, consumption, or splenic disorder.'