Thus we see that the second and third children have a very good chance to live through the first year. Children arriving later have less and less chance, until the twelfth has hardly any chance at all to live twelve months.
This does not complete the case, however, for those who care to go farther into the subject will find that many of those who live for a year die before they reach the age of five.
Many, perhaps, will think it idle to go farther in demonstrating the immorality of large families, but since there is still an abundance of proof at hand, it may be offered for the sake of those who find difficulty in adjusting old-fashioned ideas to the facts. The most merciful thing that the large family does to one of its infant members is to kill it. The same factors which create the terrible infant mortality rate, and which swell the death rate of children between the ages of one and five, operate even more extensively to lower the health rate of the surviving members.

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "Thus we see that the second and third children have a very good chance to live through the first year. Children arriving later have less and less chance, until the twelfth has hardly any chance at all to live twelve months.
This does not complete the case, however, for those who care to go farther into the subject will find that many of those who live for a year die before they reach the age of five.
Many, perhaps, will think it idle to go farther in demonstrating the immorality of large families, but since there is still an abundance of proof at hand, it may be offered for the sake of those who find difficulty in adjusting old-fashioned ideas to the facts. The most merciful thing that the large family does to one of its infant members is to kill it. The same factors which create the terrible infant mortality rate, and which swell the death rate of children between the ages of one and five, operate even more extensively to lower the health rate of the surviving members." in the context of "Chapter 5, "The Wickedness of Creating Large Families."" to mean that wisdom is timeless.