Fifth house is the significator of children in horscope. Fifth house needs to be analysed for couples planning child birth. A good fifth house is the cornerstone for having healthy, beautiful, intelligent and obedient children. A bad fifth house normally suggests complications in child birth or possible frictions with children later in life.

Friendly influences on fifth house in birth-time and transit chart can allow for smooth delivery without much complications. Inversely if there are malefic influences on fifth house in birth-time and transit chart than chances of miscarriage are not entirely ruled out.

Jupiter is significator of children among planets. Along with fifth house condition of Jupiter is equally important in determining children and their inherent qualities. Jupiter is the planet of abundance. Normally those who have more children have Jupiter influencing fifth house or second house in a friendly sign or strong Jupiter with fifth house or second house lords.

Jupiter's influence on fifth house doesn't necessarily guarantee more children. But it does increase chances of raising and dealing with children in one way or another. That could include teaching children, running orphanage or any simiar roles where children are involved. Not just human children it can be children of any other animal species.

Second house deals with family and wealth. Those who have more than three children are likely to have a good second house. A bad second house has been known to delay starting one own's family and having children. Troublesome placement of Mars in second house and aspecting fifth house can sometimes cause complications in pregnancy and limit number of children.

Seventh house deals with reproductive organs. According to vedic astrology sperm count in males and egg count in females are controlled by seventh house and Venus. While twelfth house and to some extent eight house determine sex life the ability to reproduce and have an offspring is largely determined by seventh house and Venus. If there is strength in both than there are chances of having more children. If there are malefic influence on seventh house and Venus than there can be difficulties in conceiving children in natural way.

Vimshottari dasha is equally important in determining favorable time to plan pregnancy. Majority of the miscarriages that seem to happen are during bad dasha(period) and antardasha(subperiod). A favorable dasha-antardasha period of fifth lord, second lord, Jupiter, Mercury or Venus is much more likely to allow smooth delivery without complications.

Planetary transits and friendly influence are much more likely to allow pregnancy and smooth delivery. Conversely troublesome transits of Saturn, Rahu or Ketu especially on enemy sign in fifth house seem to cause miscarriage. Ofcourse friendly influence of Saturn, Rahu or Ketu on fifth house may allow child birth but some complications still possible during pregnancy.

According to science the sperm count and egg production decrease after a certain age. As such its important for couples to plan kids at the right age preferably before thirty-five years of age.

Child Bearing Age: Healthline Article

Ageing Affects Fertility: American College of Gynecologists

Sperm Count Affected With Age: National Institute of Health Study