There is a measurable correlation with lifetime income.
high school graduates can expect, on average, to earn $1.2 million; those with a bachelor's degree, $2.1 million; and people with a master's degree, $2.5 million.But as Thomas Sowell says, you'll also find a correlation between children who have logged a lot of airplane miles and lifetime income. This doesn't mean that we should fly children around in planes all day.
Furthermore, single motherhood is by far the factor most correlated with poverty. (This fact ties in with this discussion, but you have to connect a lot of dots).
But all of this is irrelevant to the purpose of bringing children into this world: preparing them for heaven. Earth is a factory for populating heaven, not a race to see who finishes with the most toys.
Not really relevant to this discussion. I'm much more concerned with what happens to children in this world. The hereafter, if it exists, is above my pay-grade.