On the failure of getting offspring of the first class, the mother should try to get the offspring of the next class and so on. At the time of emergency (failure of offspring), men raise up sons by their accomplished younger brothers.
पूर्वपूर्वतमाभावं मत्वा लिप्सेत वै सुतम्। उत्तमादवराः पुंसः काङ्क्षन्ते पुत्रमापदि॥