There is of course davening and Brochos from Tzadikim, but the Kitzur Shulchan Aruch(סי' ע"ה סעי' ב'ב') brings that saying the Haftorah of the first day of Rosh hashanah (Shmuel Aleph 1:2-10) after lighting Shabbos candles is a segulah to have Children.