Astanga Hrudaya
तस्मिंस्त्वेकाहयातेऽपि कालः सूतेरतः परम्। वर्षाद्विकारकारी स्यात्कुक्षौ वातेन धारितः॥६६॥
Time for delivery of chil: Anything, after even one day after this month, is the time for the birth of the child; if it ( fetus) is retained inside the abdomen for a year by Vata leads to abnormalities (disorders for both the mother and the child)
english translation
tasmiMstvekAhayAte'pi kAlaH sUterataH param। varSAdvikArakArI syAtkukSau vAtena dhAritaH॥66॥
hk transliteration by Sanscript