Kautilya's Arthashastra 7.17.28

7.17.28

putrasarvasvadāne saṃdhiś cet putraphalato viśeṣaḥ //

When peace is made by handing over the whole lot of sons, advantage is to be sought in capacity to beget additional sons; capacity to beget additional sons being common, he who can beget able sons will have more advantages than another king (who is not so fortunate); capacity to beget able sons being common, he by whom the birth of a son is early expected will have more advantages than another (who is not so fortunate).