mtnbkr:
This one was pretty easy to find:
OH, here's anohter one:
If you read the entire chapter (Titled "The Wickedness of Creating Large Families"), you'll see she's comparing that with the fate of those same children when being raised by poor families who breed like rabbits, forcing the children to vie for already limited resources. She isn't advocating infanticide, but simply pointing out the cruelty of having yet more children you can't adequately provide for. That correlates to what I quoted above where she advocates for birth control and considers abortion and infanticide barbaric.
The immorality of large families lies not only in their injury to the members of those families but in their injury to society...Labor is oppressed because it is too plentiful; wages go up and conditions improve when labor is scarce. Large families make plentiful labor and they also provide the workers for the child-labor factories as well as the armies of unemployed...The large family—especially the family too large to receive adequate care—is the one thing necessary to the perpetuation of these and other evils and is therefore a greater evil than any one of them.
later in the same chapter, following a chart showing the increase in childhood death as families grow...
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. Moreover, the overcrowded homes of large families reared in poverty further contribute to this condition. Lack of medical attention is still another factor, so that the child who must struggle for health in competition with other members of a closely packed family has still great difficulties to meet after its poor constitution and malnutrition have been accounted for.
Anyway, she does not actually advocate for killing children in that chapter, nor have I seen reliable evidence she does elsewhere. What she was saying, in a "modest proposal" manner of speaking, is that families bearing large numbers of children beyond their ability to provide for them was as cruel as killing those children outright at birth.
Chris