If the Sun is placed in fifth house of horoscope, the person will have few children or no children. There may be more female child. There should be the help of other planets for male child. If Sun is more inauspicious, may have sickness children or children may die. But it all depends on other inauspicious planets effects. If Sun is placed in female sign the person is miser and may always be upset due to children.
Note: result of Sun is based on Vedic Astrology and Shastras. The results may change according to twelve different Lagnas.
Astrologer Sunil Kumar