He has to live as a vile vermin for a period of fifteen years, O Bharata. He has then to enter the womb and dic prematurely before birth.
कृमिर्भवति वर्षाणि दश पञ्च च भारत। ततो गर्भं समासाद्य तत्रैव म्रियते शिशुः॥