Phaladeepika
लग्नाधीशः पुत्रनाथेन योगं स्वोच्चे स्वर्क्षेचारगत्या समेति । पुत्रप्राप्तिः स्यात्तदा लग्ननाथः पुत्रर्क्षं वा याति धीशाप्तभं वा ॥ २६॥
Find witen the lord of Lagna comes during his transit (1) in conjunction with the lord of the 5 th house ( 2 ) to hrs exallation sign (3) to his own Rasi (1) to the 5 th house and (5) to the sign occupied by the lord of the 5 th house. During any one of these transits the birth of a son is possible.
english translation
lagnAdhIzaH putranAthena yogaM svocce svarkSecAragatyA sameti । putraprAptiH syAttadA lagnanAthaH putrarkSaM vA yAti dhIzAptabhaM vA ॥ 26॥
hk transliteration by Sanscript