When the lord of the 5th (putra bhava), posited in a kendra, is aspected by the lagna lord, or occupies its own or exaltation sign, the texts declare happiness from children.
Verse 2 — Fifth House in Venus-Moon Vargas Grants Many Sons
If the fifth house from the ascendant falls in the vargas of Venus or the Moon and is joined with, or aspected by, Venus and the Moon while remaining untouched by malefics, the native is richly blessed with sons; but if that same fifth house is aspected by Saturn or Rahu, he is left without sons.
Verse 3 — Benefic Influence on the Fifth Guarantees Children
पुत्रस्थाने तदीशे वा गुरौ वा शुभवीक्षिते । शुभग्रहेण संयुक्ते पुत्रप्राप्तिर्न संशयः ॥ १६॥
When the fifth house itself, its lord stationed there, or Jupiter in it is aspected by a benefic, or conjoined with a benefic planet, the attainment of children follows without doubt.
Verse 4 — Strong Fifth Lord and Jupiter Secure Progeny
With the lord of the ascendant standing in the house of children, the lord of the fifth endowed with strength, and Jupiter possessed of complete power, the attainment of progeny is beyond doubt.
Verse 5 — Full-Strength Jupiter in the Fifth Aspected by Lagna Lord
When Jupiter occupies the fifth house invested with complete strength and receives the aspect of the lord of the ascendant, the attainment of sons is beyond doubt.