Behold, children are a heritage from the Lord,The first time I read this Psalm, the first two verses seemed totally disconnected with the remaining verses. This whole passage, though, is about the building of a "house", and what "house" is really complete without children.
the fruit of the womb a reward.
I could be wrong in this interpretation, but I believe that the majority of the verses in this chapter have to do with children because they are truly the greatest blessing of house building.
In this verse we see that they are a reward and that they are a heritage... and that they come from the Lord. The word that is translated heritage has to do with possession. They belong in God's kind of house. The word reward is many times translated as wages or fare or fee. They are the result of God's kind of house building.
There are some who do not have the benefit of children, because of physical issues. There is ultimately nothing that can be done about that. The fruit of the womb is in God's hands. That desire, even though it can get a little distorted, to have children is not a wrong desire, in and of itself. But to not have children because of careers or other worldly passions shows a lack of God's kind of house-building.