The fifth house is the 5th from ascendant when counted anti-clockwise. If the master of 5th house is present in exaltation or in own house, specially if in center (1,4,7,10) or in trine (1,5,9), it will give native good results. The 5th house is also called the Santan Sthan (the house of progeny). If the native has strong master of 5th house, he/she will have talented and bright children. The children will be obedient and will be greatly attached to the native. Besides the 5th house, we also consider the divisional chart D7 for happiness from kids and their future etc.
The 5th house mostly signifies the following:
1. The children of the native
2. Romance in life of native
3. Spiritual grace,
4. Virtues from previous lives,
5. Heart, upper abdomen, stomach, liver
6. Gall bladder, spleen, mind, thinking, pancreas.
During the dasa, antardasa of the Lord of 5th house, you will see the above significations of 5th house, taking prominence in your life. Most of the time the prediction of birth is kids is taken as per timing relaed to dasa of 5th lord or planets aspecting/influencing the 5th house/lord. We must also consider D7 for such predictions.