Childlessness
I give below the possible combinations of Planets in a boy's or girl's horoscope which could lead to know from a birth chart on 'Childlessness' :
1. The Lord of Lagna and Mercury (Both) occupy the 4th, 7th, or 10th House :
2. Mars placed in Lagna, Saturn in8th house from Lagna, and Sun in the fifth house;
3. If the 5th, 8th, and twelfth houses from Lagna are occupied by natural malefic;
4. If the natural Malefic occupy the 4th House, Venus in 7th house and the Moon in 10th House from Lagna;
5. If the natural Malefic, not in aspect from natural Benefics, occupy the 8th house from the position of Moon in a birth chart;
6. If the 4th House from Lagna occupied by natural Malefic, Jupiter occupies 5th House, and Venus in 7th House from Lagna;
7.When Malefic occupy ascendant/7th/ 12th Houses, the Moon in the 5th House, it is positive such a natal will not have child at all;
Further 'Beeja Sputa' and 'Kshethra Spuda' are important for study, to decide the strength of sperm in the male and female fluids to be strong in either charts of a husband and wife, and when it is found 'weak' under astrological rules, - a must in a female chart - there is no possibility between them to have a child. Here, the rules are many while 'standard' and this has to be carefully studied, before marriage 'match' itself.